In 2005, she appeared in the Philippe Vidal thriller House of 9, and starred opposite Billy Zane in the film Survival Island.In 2006, she starred in an Agatha Christie's Marple drama on ITV and appeared as herself throughout the second series of Moving Wallpaper, also for ITV, in 2009.In January 2009, she joined the third series of Britain's Got Talent as a fourth judge, but was subsequently axed from the programme after less than a week on the panel, the producers having decided the four-judge format was "too complicated".
In 2016, Brook served as a team captain on the Channel 5 panel show It's Not Me, It's You.
In 1997, Brook appeared in a Pulp video "Help the Aged" with Huck Whitney of the band the Flaming Stars, in a slow dance sequence.
Brook made her full screen debut with a minor role in the film Sorted.
Shortly thereafter, she appeared in the film Ripper.
Brook and Fortuna were put into fourth place, but with the studio audience's vote they came second to Jill Halfpenny and Darren Bennett.
In 2008, Brook took Jennifer Ellison's place as one of the three judges on the second series of the reality TV programme Dirty Dancing: The Time of Your Life, broadcast between September and November 2008.She acted in the science fiction thriller Shadow Play, directed by Nick Simon.Kelly also played as herself in the British comedy film Keith Lemon: The Film.on Thursday, the TV star opened up about her personal life, and revealed why she is happier than ever."I see it as a success that I'm 36 and still not married with children.Appearing in this list every year since 1998, she ranked No.34 in 2008, No.67 in 2009 and No.7 in 2010.