At 16 she won rave reviews for her role as Kristin Scott Thomas's wayward daughter in Keeping Mum ? a part that not only involved her appearing topless but also brought her into contact with an intimidating cast that included Dame Maggie Smith.
Tamsin emerged from that film with more than just favourable reviews ? Andy Jones (who played the first of her string of boyfriends in the film) has been her real-life boyfriend for the past 18 months.
Andy, 27 ? a semi-professional footballer who began his acting career in Hollyoaks, and was once romantically linked with Sadie Frost ? is, according to Tamsin, unfazed by her greater success and the fact that she is "always cast as a nymphomaniac2 (Chelsea wears Agent Provocateur lingerie and runs a phone sex-line from her dormitory in St Trinian's).
They don't live together (Tamsin rents a "tiny" flat in South London and Andy lives in East London) but they spend all their down-time together, and she is an avid supporter of both the team he plays for (Enfield Town) and the team he loves (Manchester United).