13 Going On 30 (2004)

Director: Gary Winick
Genre: Comedy | Fantasy | Romance
Runtime: 98 min
Country: USA
Language: English
Starring: Jennifer Garner, Mark Ruffalo, Judy Greer, Andy Serkis

Plot:
A 13 year old girl plays a game on her 13th birthday and wakes up the next day as a 30 year old woman.

http://www.imdb.com/title/tt0337563/
http://en.wikipedia.org/wiki/13_Going_on_30