Alexa Vega is well-known for her role in the 2001 film "Spy Kids."
The 24-year-old unveiled a more grown-up look on the set of "Machete Kills" last year.
Abigail Breslin's breakout role was as Mel Gibson's daughter in "Signs" before she received an Oscar nomination for "Little Miss Sunshine" at age 10.
Today, 16-year-old Breslin is starring alongside Halle Berry in new movie "The Call."
Macaulay Culkin charmed America in 1990 when he played the lead in "Home Alone."
Culkin recently made headlines for his current gaunt frame. He lives in New York and works as a DJ.
Oliwia Dabrowska was "red coat girl" from the 1993 film "Schindler's List."
Today, she is 24 and says the role traumatized her for life.
Mayim Bialik will forever be known as Blossom, a teenage girl living with her father and two brothers.
She kept a fairly low profile until 2010, when she snagged a role on the hit series "The Big Bang Theory."
Melissa Joan Hart played Clarissa on the '90s Nickelodeon series "Clarissa Explains It All" and ABC's "Sabrina the Teenage Witch."
Today, Melissa is a mother of two, her "favorite role yet," according to her Twitter account.
Mike Maronna played Big Pete on the series "The Adventures of Pete and Pete."
Today, Maronna prefers to work behind the scenes. He was an electrician for the "Sex and the City" movie.
Danny Tamberelli played the mischievious younger brother, Little Pete, on "The Adventures Of Pete And Pete."
Today, Tamberelli is a college graduate with a folk band. He also belongs to a sketch comedy group called Man Boobs: Sketchy Comedy.
Freddie Prinze Jr. was every teenage girl's crush in the 1990s, starring in "She's All That" and "I Know What You Did Last Summer."
Today, Prinze keeps a lower profile, working as a producer for WWE.
Rachael Leigh Cook played Prinze's tomboy-turned-hottie love interest in "She's All That."
Cook is now working on the ABC series "Perception."
Ben Savage played Cory Matthews, the lead character on "Boy Meets World."
Savage since earned a degree in politics from Stanford and is set to star in an updated version of the show titled "Girl Meets World" about Cory and Topanga's daughter.
Rider Strong played Shawn Hunter, Cory's best friend and sidekick on "Boy Meets World."
Strong graduated from Columbia University, and created a campaign video for Barack Obama's 2008 campaign.
Will Friedle played Cory's older brother on "Boy Meets World."
Today, Friedle does voice-over work for animated series.
Danielle Fishel played Topanga, Cory's girlfriend and later wife, on "Boy Meets World."
Today, Fishel is a certified psychologist and will be reprising her role as Topanga in the upcoming "Girl Meets World."
Lark Voorhies played Lisa, a shopping-obsessed rich girl in the high school television series "Saved By The Bell."
Today, Lark is almost unrecognizable and denies reports that she is bipolar.
Elizabeth Berkley is best-known for playing Jessi, the smart girl, on "Saved By The Bell."
Today, Elizabeth, seen here with former cast member Mario Lopez, is helping MTV develop a reality show about teen girls seeking advice.
Tiffani Thiessen played hottie Kelly Kapowski on "Saved By The Bell." She also starred in "Beverly Hills 90210."
She kept a low profile for several years but now works on the USA series "White Collar."
Candace Cameron played big sister DJ Tanner on the hit show "Full House."
Candace got married in 1996 and now goes by the name Candace Cameron Bure. She spends much of her time lobbying for conservative issues.
Jodie Sweetin played middle child Stephanie Tanner on "Full House."
Today, she's newly engaged and has a child. She also allegedly owes $30,000 in back taxes to the government.
Kirk Cameron won hearts playing Mike Seever on the show "Growing Pains."
Today, Cameron is an active voice for the conservative party — like his sister, Candace Cameron Bure.
Tracey Gold played younger sister Carol on "Growing Pains."
Today, Tracey is married with four sons. She recently participated in the show "Celebrity Wife Swap."
Jonathan Taylor Thomas was THE heartthrob of the '90s. He acted in "Home Improvement," "Tom and Huck," and voiced "The Lion King."
Today, he goes by his legal name, Jonathan Weiss. He studied at Harvard and has a degree from Columbia.
Jaleel White will forever be known as Urkel, the character he played on the show "Family Matters."
Today, Jaleel doesn't look so puny. He appeared on "Dancing With The Stars" and hosts a game show on SyFy.
Kellie Williams played Laura Winslow, the object of Urkel's affections on "Family Matters."
Today, Williams lives in D.C. with her family and founded a children's theater.
Brittany Ashton Holmes was adorable as Darla in the hit movie "Little Rascals."
Today, she's all grown up, as evidenced by this photo from her MySpace page that made the rounds on Tumblr last year.
Jason James Richter was picked from 4,000 candidates to play the lead role of Jesse in "Free Willy."
He's now a bassist for the band Fermata.
Vinessa Shaw is best-known for starring in the 1993 Disney smash hit "Hocus Pocus."
Shaw continues to act. Most recently, she was seen in the film "3:10 To Yuma" with Russell Crowe.
Tia and Tamera Mowry starred in the series "Sister Sister," a show about twins with opposite personalities.
Today, they're both married with children. The two starred in the Lifetime movie "Double Wedding."
Here's Kel Mitchell from "Kenan & Kel," the wildly popular Nickelodeon series. He faded out of the spotlight after competing against Kenan for a spot on "Saturday Night Live" — and lost.
Today, Kel is looking more sophisticated than his burger-flipping character. He's had some bit roles on television since the height of his fame.
Amanda Bynes was a child star on Nickelodeon's popular sketch comedy show, "All That."
The now 26-year-old has already announced her retirement from acting and was recently evicted from her New York apartment according to reports.
You've seen "then and now" pics of child stars ....
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