Flashback: Celebrity Yearbook Photos

In her senior yearbook, this teen (pictured left) wrote that her biggest dream was "to headline at Madison Square Garden." (Credit: Seth Poppel/Yearbook Library)

Just a few short years after high school, Stefani Germanotta dyed her hair platinum blond and transformed into international superstar Lady Gaga. And yes, she has headlined Madison Square Garden -- three times, in fact! Kevin Kane/WireImage May 13, 2010

This music maven was a popular student who apparently really loved her hometown of Anaheim, California, since she didn't move out of her parents' house until she was 30! Credit: Seth Poppel/Yearbook Library

Kate Hudson 8th Grade 1993 Crossroads School, Santa Monica, CA Credit: Seth Poppel/Yearbook Library

HOLLYWOOD, CA - JULY 31: Actress Kate Hudson arrives to the premiere of HBO Films' "Clear History" at ArcLight Cinemas Cinerama Dome on July 31, 2013 in Hollywood, California. (Photo by Alberto E. Rodriguez/Getty Images)

Snoop Dogg (Cardozar Broadus) Senior Year 1989 David Starr Jordan High School, Long Beach, CA Credit: Seth Poppel/Yearbook Library

PACIFIC PALISADES, CA - AUGUST 18: Rapper Snop Dogg attends the 1st Annual Athletes Center Celebrity Flag Football on August 18, 2013 in Pacific Palisades, California. (Photo by Rodrigo Vaz/FilmMagic)

Jennifer Aniston Senior Year 1987 LaGuardia High School of Music & the Arts, New York, NY Credit: Seth Poppel/Yearbook Library

NEW YORK, NY - MAY 08: Jennifer Aniston launches Living Proof Good Hair Day Web Series at The Royalton Hotel on May 8, 2013 in New York City. (Photo by Jamie McCarthy/Getty Images for Living Proof)

HOLLYWOOD, CA - APRIL 25: Actor Sean Penn arrives at the Armani party during Paris Photo LA - Opening Night at Paramount Studios on April 25, 2013 in Hollywood, California. (Photo by Paul Redmond/Getty Images)

Sean Penn 9th Grade 1975 Malibu Park Junior High, Malibu, CA Credit to: Seth Poppel/Yearbook Library

Emilio Estevez Senior Year 1980 Santa Monica High School, Santa Monica, CA Credit: Seth Poppel/Yearbook Library

LOUISVILLE, KY - MAY 04: Actor Emilio Estevez attends the 139th Kentucky Derby at Churchill Downs on May 4, 2013 in Louisville, Kentucky. (Photo by Stephen Lovekin/WireImage)

LONDON, ENGLAND - APRIL 18: Robert Downey Jr seen leaving his hotel on April 18, 2013 in London, England. (Photo by Neil P. Mockford/FilmMagic)

Robert Downey Jr
Credit: Seth Poppel/Yearbook Library

Matt Damon Senior Year 1988 Cambridge Rindge and Latin, Cambridge, MA Credit: Seth Poppel/Yearbook Library

WESTWOOD, CA - AUGUST 07: Actor Matt Damon arrives at the Los Angeles Premiere "Elysium" at Regency Village Theatre on August 7, 2013 in Westwood, California. (Photo by Jon Kopaloff/FilmMagic)

David Duchovny Senior Year 1978 Collegiate School, New York, NY Varsity Basketball Credit: Seth Poppel/Yearbook Library

HOLLYWOOD, CA - FEBRUARY 27: David Duchovny arrives at the Los Angeles premiere of "Phantom" held at TCL Chinese Theatre on February 27, 2013 in Hollywood, California. (Photo by Michael Tran/FilmMagic)

Cameron Diaz 9th Grade Charles Evans Hughes Junior High School, Long Beach, CA Credit: Seth Poppel/Yearbook Library

NEW YORK, NY - JUNE 10: Cameron Diaz attends the Stella McCartney Spring 2014 Collection Presentation at West 10th Street on June 10, 2013 in New York City. (Photo by Kevin Mazur/WireImage)

Ben Affleck Senior Year 1990 Cambridge Rindge and Latin School, Cambridge, MA Credit: Seth Poppel/Yearbook Library

LOS ANGELES, CA - JUNE 13: Actor Ben Affleck attends the Directors Spotlight at the 22nd annual UCLA School Of Theater, Film and Television Film Festival at Directors Guild Of America on June 13, 2013 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)

Kevin Spacey (Fowler) Senior Year 1977 Chatsworth High School, Los Angeles, CA Credit: Seth Poppel/Yearbook Library

NEW YORK, NY - AUGUST 26: Actor Kevin Spacey attends the 13th Annual USTA Serves Opening Night Gala at USTA Billie Jean King National Tennis Center on August 26, 2013 in New York City. (Photo by Monica Schipper/FilmMagic)

Gwyneth Paltrow Senior Year 1990 Candid Spence School, New York, NY Credit: Seth Poppel/Yearbook Library

HOLLYWOOD, CA - FEBRUARY 26: Gwyneth Paltrow arrives at the 84th Annual Academy Awards at Hollywood & Highland Centre on February 26, 2012 in Hollywood, California. (Photo by Jeffrey Mayer/WireImage)

Jeremy Piven Senior Year 1983 Evanston Township High School, Evanston, IL Credit: Seth Poppel/Yearbook Library

ASCOT, ENGLAND - AUGUST 04: Jeremy Piven attends day 2 of the Audi Polo Challenge at Coworth Park Polo Club on August 4, 2013 in Ascot, England. (Photo by David M. Benett/Getty Images for Audi)

These days, Gwen Stefani is all grown up with a wildly successful music career, multiple fashion lines, two kids, and a rocker husband. Vittorio Zunino Celotto/WireImage.com - May 20, 2011

Recognize the blue-eyed star who went from being "Clueless" to a funny film favorite? Credit: Seth Poppel/Yearbook Library

Today, Paul Rudd has become the go-to leading man for blockbuster comedies. (Jeff Kravitz/WireImage)

Though this actress attended middle school in Los Angeles in the late '90s, her big break came playing a student from a very different generation. (Credit: Seth Poppel/Yearbook Library)

Mila Kunis, now 28, started out on the small screen in the sitcom "That '70s Show" and most recently gained attention for her role in the psychological thriller "Black Swan," opposite Natalie Portman. Jason LaVeris/FilmMagic.com - June 4, 2011

Too bad Guitar Hero wasn't around when this future superstar was in high school. He definitely would have been the champ in his circle of friends! Credit: Seth Poppel/Yearbook Library

These days, the Grammy-winning John Mayer is a real guitar hero! Lester Cohen/WireImage March 18, 2010

One of TV's funniest women had one seriously funny hairdo in her 1989 senior class yearbook photo. The go-getter was also a member of her Burlington, Massachusetts' high school soccer, basketball, and cheerleading teams. Splash News

Comic actress Amy Poehler still focuses on extracurricular activities as the kooky Leslie Knope on NBC's "Parks and Recreation." Jesse Grant/WireImage.com - August 14, 2011

Back in high school, this omnipresent media personality kept just as busy as he does today. Credit: Seth Poppel/Yearbook Library

Currently, Ryan Seacrest is the host of "American Idol," "E! News," his radio show "On Air With Ryan Seacrest," and the weekly "American Top 40." Whew! Chelsea Lauren/WireImage March 4, 2010

While attending high school in San Diego just eight years ago, did this soon-to-be reality star ever imagine she'd bare it all in Playboy ... or briefly become the girlfriend of its elderly editor-in-chief? Credit: Seth Poppel/Yearbook Library

Post Playboy, the perky Kendra Wilkinson married NFLer Hank Baskett, got her own reality show, gave birth to a son, and appeared on "Dancing With the Stars." That's one busy gal! Jason LaVeris/FilmMagic.com - August 4, 2011

With his spiked blond hair and charming grin, this youngster could have easily passed for a member of the Backstreet Boys. Splash News

These days, glam rock "American Idol" alum Adam Lambert could hardly be mistaken for a member of a boy band. George Pimentel/WireImage June 20, 2010

Back in 2003, this fresh-faced teenager went by "Emily" and dropped out of a Phoenix Catholic school during her freshman year to pursue an acting career. (Credit: Seth Poppel/Yearbook Library)

Turns out her risky plan worked! Now 22, Emma Stone has starred in films including "The Help" and "Crazy, Stupid, Love," and has landed the lead in next year's big-budget action film "The Amazing Spider-Man." Donna Ward/GettyImages.com - August 2, 2011

Unfortunately, this future star had a serious addiction to ratting her hair. (Credit: Seth Poppel/Yearbook Library)

Gorgeous as ever, the "Grey's Anatomy" star has thankfully ditched her towering bird's nest for a sleeker 'do. Mark Von Holden/WireImage February 8, 2008

We can only imagine that the sibling rivalry between this star and his famous brothers was even worse when they were teens! (Credit: Seth Poppel/Yearbook Library)

Alec Baldwin has certainly maintained his lush head of hair, something his character Jack Donaghy frequently gloats about on hit comedy "30 Rock." Steve Granitz/WireImage April 22, 2010

This A-list actress went from charming Tom Cruise to taking home an Oscar in 2003. (Credit: Seth Poppel/Yearbook Library)

In the years since high school, Renee Zellweger seems to have kept her chic bangs, but ditched the toothy smile for her familiar pout. (Credit: Todd Williamson/WireImage)

This actor went from being a carpenter to a major movie star thanks to George Lucas. (Credit: Seth Poppel/Yearbook Library)

At 71, Harrison Ford (aka Han Solo) is still looking pretty good! (Credit: Jordan Strauss/WireImage)

Can you spot the starlet (middle row, third from right) in this yearbook photo? (Credit: Seth Poppel/Yearbook Library)

Now starring in hit TV series "Mad Men," Christina Hendricks has left her goth years behind and blossomed into a gorgeous redhead. (Credit: Larry Busacca/GettyImages)