1. Christa B. Allen played young Jenna Rink in 13 Going On 30 (2004): Columbia Pictures
Here's what Christa looks like now (at 30!): Here's what Jennifer Garner looked like as older Jenna Rink: Columbia Pictures / Courtesy Everett Collection
And here's a side-by-side: Columbia Pictures, TikTok, Courtesy Everett Collection
2. Sean Marquette played young Matty Flamhaff in 13 Going On 30 (2004): Columbia Pictures
Here's what Sean looks like now: Here's what Mark Ruffalo looked like as older Matty Flamhaff: Columbia Pictures / Courtesy Everett Collection
And here's a side-by-side: Columbia Pictures, Instagram, Courtesy Everett Collection
3. Alexandra Kyle played young Tom Tom in 13 Going On 30 (2004): Columbia Pictures
Here's what Alexandra looks like now: Ray Tamarra / Getty Images
Here's what Judy Greer looked like as older Tom Tom: Columbia Pictures / Courtesy Everett Collection
And here's a side-by-side: Columbia Pictures, Ray Tamarra / Getty Images, Courtesy Everett Collection
4. Christina Ricci played young Roberta in Now & Then (1995): New Line Cinema / Courtesy Everett Collection
Here's what Christina looks like now: Phillip Faraone / WireImage
Here's what Rosie O'Donnell looked like as older Roberta: New Line Cinema / Courtesy Everett Collection
And here's a side-by-side: New Line Cinema, Phillip Faraone / WireImage, Courtesy Everett Collection
5. Thora Birch played young Teeny in Now and Then (1995): New Line Cinema / Courtesy Everett Collection
Here's what Thora looks like now: Jon Kopaloff / Getty Images
Here's what Melanie Griffith looked like as older Teeny: New Line Cinema / Courtesy Everett Collection
And here's a side-by-side: New Line Cinema, Jon Kopaloff / Getty Images, Courtesy Everett Collection
6. Tanvi Ganesh Lonkar played Young Latika in Slumdog Millionaire (2008): Fox Searchlight / Courtesy Everett Collection
Here's what Tanvi looks like now: Here's what Freida Pinto looked like as older Latika: Fox Searchlight / Courtesy Everett Collection
And here's a side-by-side: Fox Searchlight, Instagram, Courtesy Everett Collection
7. Tanay Chheda played young Jamal in Slumdog Millionaire (2008): Fox Searchlight / Courtesy Everett Collection
Here's what Tanay looks like now: Vivien Killilea / Getty Images for Creamy W Group LLC
Here's what Dev Patel looked like as older Jamal: Fox Searchlight / Courtesy Everett Collection
And here's a side-by-side: Fox Searchlight, Vivien Killilea / Getty Images for Creamy W Group LLC, Courtesy Everett Collection
8. Kyla Pratt played young Monica in Love & Basketball (2000): New Line Cinema
Here's what Kyla looks like now: Jc Olivera / Getty Images
Here's what Sanaa Lathan looked like as older Monica: New Line Cinema / Courtesy Everett Collection
And here's a side-by-side: New Line Cinema, Jc Olivera / Getty Images, Courtesy Everett Collection
9. Glenndon Chatman played young Quincy in Love & Basketball (2000): New Line Cinema
Here's what Glenndon looks like now: Alberto E. Rodriguez / WireImage
Here's Omar Epps as older Quincy: New Line Cinema / Courtesy Everett Collection
And here's a side-by-side: New Line Cinema, Alberto E. Rodriguez / WireImage, Courtesy Everett Collection
10. Peyton List played young Jane in 27 Dresses (2008): 20th Century Fox
Here's what Peyton looks like now: Jeff Kravitz / FilmMagic
Here's Katherine Heigl as older Jane: 20th Century Fox / Courtesy Everett Collection
And here's a side-by-side: 20th Century Fox, Jeff Kravitz / FilmMagic, Courtesy Everett Collection
11. Zac Efron played young Mike in 17 Again (2009): New Line Cinema / Courtesy Everett Collection
Here's what Zac looks like now: John Fleenor / ABC via Getty Images
Here's Matthew Perry as older Mike: New Line Cinema / Courtesy Everett Collection
And here's a side-by-side: New Line Cinema, John Fleenor / ABC via Getty Images, Courtesy Everett Collection
12. Here's Michael Conner Humphreys as young Forrest Gump in Forrest Gump (1994): Paramount / Courtesy Everett Collection
Here's what Michael looks like now: Here's Tom Hanks as older Forrest Gump: Paramount / Courtesy Everett Collection
And here's a side-by-side: Paramount / Courtesy Everett Collection, Instagram
13. Dakota Fanning played young Melanie in Sweet Home Alabama (2002): Buena Vista Pictures
Here's what Dakota looks like now: Axelle / FilmMagic
Here's what Reese Witherspoon looked like as older Melanie: Walt Disney Co. / Courtesy Everett Collection
And here's a side-by-side: Buena Vista Pictures, Axelle / FilmMagic, Walt Disney Co. / Courtesy Everett Collection
14. Robert De Niro played young Vito Corleone in The Godfather Part II (1974): Courtesy Everett Collection / Paramount Pictures
Here's what Robert De Niro looks like now: Dominik Bindl / WireImage
Here's what Marlon Brando looked like as older Vito Corleone: Courtesy Everett Collection / Paramount Pictures
And here's a side-by-side: Courtesy Everett Collection / Paramount Pictures, Dominik Bindl / WireImage
15. Francis Capra played young Calogero in A Bronx Tale (1993): Savoy Pictures / Courtesy Everett Collection
Here's what Francis looks like now: Daniel Boczarski / Getty Images for Hulu
Here's what Lillo Brancato Jr. looked like as older Calogero: Savoy Pictures / Courtesy Everett Collection
And here's a side-by-side: Savoy Pictures / Courtesy Everett Collection, Daniel Boczarski / Getty Images for Hulu
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