Katherine Louise Stewart (born 30 November 1972), known professionally as Kat Stewart, is an Australian actress who has made numerous appearances in television series, movies and on-stage.
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Early life
Kat Stewart is the daughter of Tony and Kitty Stewart and was born and raised in Bairnsdale, Victoria. When she was eight years old she, her parents and two older brothers lived and travelled in Europe for a year and Stewart said that time "opened my eyes to the world and gave me a lot of confidence." Stewart began acting in primary school and remembers: "Since Year 2 I had been getting a thrill out of doing school drama. I was on the quiet side, but I felt light in my bones when I was onstage. At university I studied marketing and arts, and joined the theatre society, which quickly became my passion. After graduation, I worked in publicity, but I couldn't shake my love of acting, so I enrolled at the National Theatre, hoping I'd outgrow it. Now I understand you need to do what you love to be happy." Stewart decided to leave PR behind to pursue acting full-time and recalled: "After I finished drama school, I had a couple of acting gigs straightaway, but then I was unemployed fairly consistently over a couple of years. I don't take anything for granted now though, so it wasn't such a bad thing. But I wouldn't want to go back there if I can avoid it."
Career
Television
Kat Stewart is best known for her role as Roberta Williams (wife of the late Melbourne gangland figure Carl Williams) in the first series of the Channel 9 TV production Underbelly and as Billie Proudman in the popular comedy/drama, Offspring on Network Ten.
It was her award-winning performance in Underbelly in 2008 that first made Stewart a household name. The portrayal of Roberta Williams drew praise from critics including Marcus Casey of The Daily Telegraph, who described it as 'one of the most compelling performances by an Australian actress in memory.' Casey expanded that it was 'a brutally brave, ugly and compelling performance...She held nothing back, and was an emotional but controlled and screeching tornado who dominated the screen whenever the camera peered her way.' The authenticity of Stewart's performance was praised by Michael Lallo in The Age, who said: "By any measure, it's the role of a lifetime. Stewart has ensured it's the standout performance of the series. Despite quality performances by all, critics say she owns every frame she's in. It's not that she delivers a superb depiction of a suburban gangster moll; it's that you really believe she is a suburban gangster moll." Although her performance was popular with critics and audiences, the real life Roberta was not a fan but Stewart was sympathetic, "Obviously, I would have preferred her to like it," she said. "But I can't control that. And if someone was playing me, I couldn't imagine I'd be happy…I have a lot of empathy for Roberta and what she's been through". Stewart acknowledges the show was a key moment in her career, "Underbelly opened a lot of doors and gave me access to better opportunities and more opportunities. I am very grateful for it".
Despite her positive experience in Underbelly, Stewart chose not to reprise the role in Fat Tony & Co in 2014. Stewart told David Knox of 'TV Tonight': "..Seven years ago when I did it we didn’t know much about Roberta Williams. So I did as much research as I could...Now we know how she walks and talks and so much more about her...I don’t like turning down work. It goes against every actor instinct. But it just didn’t feel right".
After the success of Underbelly Stewart next appeared in the critically acclaimed relationship drama, Tangle (2009–2012) on Showcase. In the series Stewart played the loveable but flawed, Nat Manning alongside Justine Clarke, Ben Mendelsohn, Matt Day and Catherine McClements. Showing she has long been adroit at both drama and comedy, in 2009 Stewart appeared in the Andrew Denton produced, advertising industry satire :30 Seconds on Comedy Channel.
Stage
Kat Stewart has won acclaim on-stage in a range of dramatic and comedic roles. As an ensemble member of Red Stitch Actors Theatre from 2002 to 2012 Stewart appeared in over a dozen plays for the company including The Little Dog Laughed, The Shape of Things, Rabbit Hole, Bug, Dirty Butterfly, Play About the Baby and Loyal Women. In 2010 she appeared in the part of Tekla in an update of August Strindberg's Creditors.
In 2014 Stewart featured in Melbourne Theatre Company's production of The Speechmaker. The political satire was the first play from Australian filmmakers Working Dog Productions and the writing trio of Santo Cilauro, Tom Gleisner and Rob Sitch. When asked about the production and returning to the stage after a four-year break Stewart said "I’ve always wanted to work with [producers and writers] Working Dog. The script is engaging, smart, alarming and funny. I used to do six or seven plays a year. But I think you can lose your nerve if you leave it too long." The play also featured Stewart's Offspring cast-mates, Lachy Hulme and Jane Harber. Stewart had previously worked with MTC on productions such as Festen in 2006 and 2008's Frost/Nixon. In August 2016 she had a starring role on stage in the MTC production of Ayad Akhtar's 2013 Pulitzer Prize winning play, Disgraced, earning critical praise in the part of Emily.
Stewart appeared in the 2019 Melbourne Theatre Company production of the Simon Stephens' penned romantic comedy, Heisenberg. The production was directed by Tom Healey and co-stars Peter Kowitz. Stewart earned praise in the role of Georgie with Andrew Fuhrmann of the Herald Sun saying, "This new MTC production is elegantly done, with a slow, almost meditative rhythm. And it features a wonderfully engrossing performance by Offspring star Kat Stewart." He further summarised, "... really, the best reason to see this production is Stewart's finely modulated performance. Her Georgie is both utterly untrustworthy and deeply sympathetic."
In 2022 Stewart returned to the stage in the Melbourne Theatre Company production of Joshua Harmon's education satire Admissions. The production was directed by Gary Abrahams and co-starred William McKenna, Heidi Arena, Simon Maiden and Deidre Rubenstein. Cameron Woodhead of The Age described Stewart's performance as '...the glossiest possible portrayal of liberal officiousness and the cynical abyss her wokeness teeters into when the chips are down.'
Stewart starred as Martha in three productions of Who's Afraid of Virginia Woolf?, alongside the same cast including real-life partner, David Whiteley, as well as Harvey Zielinski and Emily Goddard. In 2023 and 2024 the quartet appeared in Red Stitch Actors Theatre productions, including a season at the Comedy Theatre in Melbourne, and followed by a Sydney Theatre Company run at the Roslyn Packer Theatre in late 2025. John Shand of the Sydney Morning Herald and The Age put the Sydney production in his top 5 of 2025, saying of Stewart "This is a performance that will throb in the memory bank long after age has pilfered most of them. Stewart’s light-switch mood changes are scary enough; her Martha’s rage is cyclonic, her intellect formidable, her capacity for alcohol bottomless and the terror on her face near the end heartbreaking."
Film
Stewart appeared in West of Sunshine, a movie directed by Jason Raftopoulos and released in Australian cinemas in 2018. The urban drama also stars Damian Hill, Ty Perham, Arthur Angel and Kaarin Fairfax.
In 2019 Stewart has a supporting role in Little Monsters. The zombie comedy horror film, written and directed by Abe Forsythe, premiered at the Sundance Film Festival in January 2019 and stars 2013 Oscar winner Lupita Nyong'o, Josh Gad, Stephen Peacocke and Nadia Townsend.
Radio and podcasts
In December 2020 Stewart co-hosted How Big is My Trailer, an interview series bringing together two well known Australians in a "revealing and open-hearted conversation hour about the highs, lows and left turns of navigating a truly successful life in film, television and the arts." Stewart co-hosted with interviewer/producer Angela Pulvirenti and each episode paired some of Australia's leading creative talents including George Miller with Tim Minchin, Asher Keddie with Daina Reid, Damon Herriman with Emma Freeman, Eric Bana with Trent Dalton, Eddie Perfect with Tina Arena. How Big is My Trailer is available as a podcast.
Personal life
Stewart married fellow actor David Whiteley in Melbourne in February 2008. The couple met while working at Red Stitch Actors Theatre in 2002. Their first child, a boy named Archie Nicholas Whiteley, was born on 12 January 2012. The actors share parenting duties between work commitments, "The great thing about this profession is it’s a period of intense work but you have great breaks as well. We co-parent; it’s 100 per cent a team effort. We also have parents who are besotted with Archie," Stewart said in 2014.
Stewart and Whiteley had a second child, a daughter named Georgia Kitty Whiteley (known as Gigi) born on 16 March 2016.
Stewart's mother died of pancreatic cancer in 2015. "My mum, Kitty, was the ultimate mother: fiercely protective, sometimes overinvolved, incredibly hospitable, very self-deprecating and oh-so stylish...Losing her felt catastrophic, but I've gotten to a point now where I feel grateful for having her at all. Not everyone has that kind of relationship with their mum – I'm so lucky," Stewart confided to Alley Pascoe of Marie Claire in 2020. Stewart has a close relationship with her father, Tony, telling Jane Rocca of The Sydney Morning Herald in 2018, "Dad and I are very close and talk most days now. I admire and look up to him. He is the kind of person I wanted to be like because he represents the values I want to instil in my kids. He has strong self-belief and is a risk-taker and has always had a strong sense of what's right."
Awards
Kat Stewart was nominated for the Graham Kennedy Award for Most Outstanding New Talent at the Logie Awards in 2006 and two ASTRA awards in 2006 and 2007 for her role in the comedy series Supernova. She won acclaim for her role as Roberta Williams in Underbelly, winning an AFI award for Best Lead Actress in a Television Drama and being nominated for two Logies in 2009, winning the Silver Logie for Most Outstanding Actress. In 2010 she was nominated again for the Silver Logie for Most Outstanding Actress, this time for Tangle, and an ASTRA award for :30 Seconds. Stewart was rewarded for her work as Billie Proudman in Offspring by winning Best Guest or Supporting Actress in a Television Drama at the 2014 AACTA Awards, a nomination for Best Lead Actress in a Television Drama at the 2015 AACTA Awards and nominations for the Silver Logie for Most Outstanding Actress in 2011, 2012 and again in 2014. The cast of Offspring were also acknowledged with nominations for the Equity Awards for Outstanding Performance by an Ensemble in a Drama Series for 5 years running from 2011 to 2015 and again in 2017. The cast of Five Bedrooms was nominated for the Equity Awards for Outstanding Performance by an Ensemble in a Drama Series in 2020.
For her theatrical work, Stewart has twice won and twice been nominated for Green Room Awards. In 2004, she won the Gerda Nicolson Award (for an Emerging Actress) and in 2006 won Best Actress for the Red Stitch productions Bug and The Shape of Things. She was nominated as Best Actress for her body of work in 2003 and again as Best Actress for the Red Stitch production of The Little Dog Laughed in 2008.
Stewart was part of the judging panel at the Tropfest Australia 2014 Short Film Festival. In 2014 Stewart also starred in the Matt Holcomb directed short film, Flat Daddy. The production was nominated for Best Short Fiction Film at the 2015 AACTA Awards.
Stewart was recognised for her performance as Martha in the Sydney Theatre Company production of Who's Afraid of Virginia Woolf? by winning the award for Best Performance in a Leading Role in a Mainstage Production at the 2025 Sydney Theatre Awards.