13 Going on 30 (2004)

Jenna is a 13-year-old teenager who, after a harrowing experience, strongly desires to leap forward in time into her 30s and to her surprise her wish comes true. Not only that: she's a successful, popular ad agency executive, but Jenna discovers that the price for her adulthood has taken away something she cares deeply about. In this romantic comedy with a nostalgic aura, the Jennifer Garner-Mark Ruffalo duo has great chemistry and has fun with their characters.