Katherine Emily Hewlett (born December 17, 1976)^[1] is a Canadian film, television, and stage actress.^[2]

On December 17, 1976 (47 years ago) (1976-12-17), Hewlett was born in Toronto, Ontario, Canada, North America.^[3]

Hewlett has worked in television, film, and theatre. Her brother is actor David Hewlett, who portrayed Rodney McKay in Stargate Atlantis.^[4] She guest-starred as McKay's sister, Jeannie Miller, in four episodes on the series.^[5] She also co-starred with him, again as his sister, in the unrelated film A Dog's Breakfast (2006).^[6]

Hewlett wrote and starred in the off-Broadway production of Humans Anonymous which was the winner of Best of Fringe and Best Ensemble at the 2008 Toronto Fringe Festival and Outstanding New Play at the 2010 New York International Fringe Festival.^[7][8]

In 2012, Hewlett was cast in the Canadian teen drama series Degrassi: The Next Generation as Margaret Matlin, a role she played until 2014. In 2013, she starred in Jeremy Lalonde's low-budget comedy feature film Sex After Kids (2013).^[9][10]

In 2014, Hewlett was cast in the comedy television series The Stanley Dynamic as Lisa Stanley. In the episode 'The Stanley Astronaut' she once again worked alongside her brother David.^[11]

Hewlett guest-starred in the 2016 Starz series The Girlfriend Experience (2016), based on Steven Soderbergh's film of the same name.^[12]

Hewlett played the role of Mayor Flaherty in the TV show Hollie Hobby in 2018.^[13]

In 2013, Hewlett published her book The Swearing Jar (2013),^[14] which has been turned into a play.^[15] In 2021, it was announced that production had begun on a further feature film adaptation,^[16] which premiered in 2022 as The Swearing Jar (2022).^[17]

Hewlett won the Canadian Screen Award for Best Original Song at the 11th Canadian Screen Awards in 2023 for "The Swearing Song", a song she wrote for The Swearing Jar.^[18]

• David Hewlett