From 1998 until 2002, she was co-host with Ant & Dec on the Saturday morning children's programme SMTV Live and hosted its spin-off programmes CD: UK (1998–2005) and CD: UK Hotshots.On SM: TV Live she often acted as an apparently slightly unwilling assistant whenever the show featured a guest appearance by a magician, participating in a number of different illusions including being sawed in half in a version of the illusion called Clearly Impossible.
Other programmes she hosted include The Record of the Year, Fame Academy, The 2004 Brit Awards and Stars in Their Eyes, as well as a weekly broadcast on London's Capital FM and BBC Choice series Roadtripping, both with former MTV colleague Edith Bowman.
In 2005 she played herself in an episode of Little Britain and provided the voice of "Loretta Geargrinder" in the UK version of the film Robots, replacing Natasha Lyonne.
In 2006, she began hosting the second season of American reality show So You Think You Can Dance, replacing Lauren Sánchez, who was pregnant.
Catherine Elizabeth "Cat" Deeley (born 23 October 1976) is an English television presenter, actress, singer and model, based in the UK and the United States.
From 1998 to 2002 she hosted the children's programme SMTV Live and its spin-off chart show CD: UK. She has also hosted Fame Academy on the BBC, and the 2004 Brit Awards.
Cat became the presenter of Stars In Their Eyes from 2003 to 2006, taking over from Matthew Kelly.Since 2006, Deeley has been the host of So You Think You Can Dance in the US, for which she has been nominated four times for the Primetime Emmy Award for Outstanding Host for a Reality or Reality-Competition Program.Since 2003, Deeley has been a patron of London's Great Ormond Street Hospital for sick children.In December 2009, she was made a UNICEF UK ambassador.She is married to Northern Irish comedian and television personality Patrick Kielty. She left full-time modelling in 1997, following changes in her contract with Storm.She moved on to co-present the MTV chart show, Hitlist UK, with close friend Edith Bowman.