13 Going on 30 (2004)

After total humiliation at her thirteenth birthday party, Jenna Rink wants to just hide until she's thirty. Thanks to some magic wishing dust, Jenna's prayer has been answered. With a knockout body, a fabulous wardrobe, an athlete boyfriend, a dream job, and superstar friends, this can't be a better life. But soon Jenna realizes that adult life isn’t as easy as she hoped for.
For some, 13 feels like it was just yesterday. For Jenna, it was.