Tina O'Brien was born 7th August, 1983 in Rusholme. She took over the role of Sarah Platt (born Tilsley) from Episode 4708 (31st October 1999). She was the third person to play the role of Sarah, taking over from Lynsay King, who had last portrayed the character earlier the same month. Other parts have been in the Coronation Street: Pantomime, ITV's Dick Whittington pantomime, and her TV debut in Children's Ward. She also appeared in Clocking Off, where her characters' brother was played by her future Street half-brother David's actor, Jack P. Shepherd.
Tina won Best Newcomer at the 2000 National Television Awards. She is godmother to Amy and Emily Walton, who played her daughter Bethany between 2000 and 2007. Tina has a daughter, Scarlett, (born in 2008) with former co-star and on-screen husband Ryan Thomas, who plays Jason Grimshaw. They had been dating since 2004, although they have now separated. She previously dated Bruno Langley who played Todd Grimshaw, brother of Jason who her Coronation Street character also dated.
She left the programme in January 2008 and appeared in an episode of Blue Murder and also, in June 2010, in a TV film The Secret Diaries of Anne Lister.
Tina gave birth to her second child, Beau, in 2014 with partner Adam Crofts. She returned to the role of Sarah in March 2015.