13 Going on 30 (2004)
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Turns out Jenna was providing rival magazine Sparkle with inside information.
She runs off to try to talk Matt out of getting married to his fiance, but he decides to go through with it anyway. Heartbroken, Jenna goes to her parents' house with the model dream house Matt built for her 13th birthday. The last of the "magic fairy dust" blows into the air, causing her to return to being a 13 year-old, waiting in the basement closet to be kissed during Seven Minutes in Heaven. She runs out and kisses 13-year-old Matt and blows off Tom-Tom.
Cut to Jenna and Matt getting married in their 30's and living happily ever after. Edit (Coming Soon)