Memba Them

American actor Adam Chambers was in his late 20s when he was cast to play Cobb -- the assistant and monster hunter in training -- in the family/adventure film "Girl vs. Monster" back in 2012.

Chambers hit the big screen with other Hollywood stars like Olivia Holt, Luke Benward and Katherine McNamara.

Canadian actress Mercedes McNab was only 13 years old when she played Amanda Buckman -- the privileged pilgrim camper -- opposite Christina Ricci as Wednesday Addams -- in the funny 1993 family film "Addams Family Values."

Former model Eli Swanson was 24 years old when he caught the eyes of millions, scoring the gig of Britney Spears' astronaut in the "Oops I Did It Again" music video.

Prior to walking the moon for Britney, he was modeling and bartending. Today, Eli is an orthopedic trauma surgeon!

"Britney! Before you go, there's something I want you to have ... Well, baby, I went down and got it for ya."

Canadian American actress Jenn Proske was in her early 20s when she played Becca Crane -- the awkward and anxious high school student, lacking joy in life -- in the comedy/horror film "Vampires Suck" back in 2010.

Jenn shared the big screen with actors Matt Lanter, Anneliese van der Pol, and Chris Riggi.

Australian actor Jaason Simmons was 43 years old when he played Baz Hogan -- the Australian surfer and Fin's right-hand man -- in the horror sci-fi film "Sharknado" back in 2013.

Simmons joined other actors on set, such as Ian Ziering, Cassie Scerbo and Adrian Bustamante.

Today's not just about Taylor Swift's album drop ... It's October 3rd, and y'all know what that means! It's "Mean Girls Day!" Swipe through our gallery and see the icons themselves ...

Yes, we've got Lindsay Lohan and Tina Fey, but don't forget about the other legends who made the film top-notch ... Lizzy Caplan, who played Janis Ian ... and Daniel Franzese, who slayed the character of Damian, just to name a couple ...

American actor Gregg Edelman was in his early 50s when he played Lead Counsel Malloy -- the suspicious dude who suspects Margaret and Andrew's marriage is an arrangement -- in  the 2009 rom-com "The Proposal."

Edelman hit the big screen with Hollywood icons like Sandra Bullock as the publishing company editor-in-chief who faked her engagement to avoid deportation, Margaret Tate, Ryan Reynolds who went along with the proposal to Margaret, Andrew Paxton and Betty White as Andrew's adorable and hysterical grandmother, Grandma Annie.

Other noteworthy cast members include Malin Akerman and Mary Steenburgen

American actress Jessica St. Clair was in her mid-30s when she played the hilarious bridal stylist at 'Bell on Blanc' -- who assists the bride-to-be (played by Maya Rudolph) and her bridesmaids on scoring the perfect dress, all the while undergoing food poisoning -- in the 2011 rom-com film "Bridesmaids."

The ensemble cast of comedic icons included Maya Rudolph as the bride-to-be and Annie's childhood bestie, Lillian, Kristen Wiig as the lonely, single and cynical gal with roommates, Annie, and Melissa McCarthy as the government worker with a newfound zest for life after falling off a ship, Megan.

Canadian singer-songwriter Daniel Powter was in his mid-30s when he and his go-to hat skyrocketed to fame -- topping the music charts for five weeks -- with his 2005 hit song "Bad Day."

Daniel wrote the hook of the bop while on a ferry ride between Vancouver and Victoria ... "Bad Day" was heavily used on the fifth season of "American Idol" -- with Powter singing the song live at the final show in 2006 ...

"Because you had a bad day, you're taking one down, You sing a sad sang to turn it around ..."

Icelandic actress Anita Briem was in her mid-20s when she was cast to play Hannah -- the fearless and independent "mountain guide" and daughter of the famous volcanologist -- in the 2008 family/adventure film "Journey to the Center of the Earth."

Anita shared the big screen with Josh Hutcherson as the only child who's being looked after by his Uncle, Sean and Brendan Fraser as Sean's quick-thinking Uncle and professor, Trevor.

Other actors in the movie include Jean Michel Paré and Kaniehtiio Horn.

Briem is also known for playing Queen Jane Seymour on "The Tudors."

Back in 2013, American actress Leah Pipes was in her mid 20s when she first started playing Camille O'Connell -- the former brave psychology student who's highly intelligent -- on the supernatural fantasy-drama spinoff series "The Originals."

Pipes was part of an ensemble cast including Joseph Morgan as Niklaus, the OG vampire who's romantically interested in Camile, Phoebe Tonkin as Hayley, the protective alpha werewolf who shares a kid with Niklaus, and Danielle Campbell as Davina, who is extremely powerful and the dependent teen witch ...

Pipes also starred in the slasher film "Sorority Row" where she played Jessica Pierson.

Before this cute lil' kiddo was a baller, he was just growin' up in Louisiana with his brothers ... a star athlete for his high school, and scoring college scholarships from schools like LSU, North Texas and TCU ...

After throwin' and soarin' thru his college career, he was the NFL Offensive Rookie of the Year in 2016 -- he had the highest passer rating as a rookie !!! TMZ has shared several updates on his new and upcoming Texas mansion.

Need one more clue? Today, he's usually rockin' with a buzzcut and some sexy scruff!

American actress Lisanne Falk was in her early 20s when she played Heather -- the nicer 'Heather' on the Westerburg High cheerleading squad whose signature color is yellow, Heather McNamara -- in the 1988 teen comedy crime "Heathers."

Falk shared the big screen with Christian Slater as Jason, the killer of three students who falls in love with Veronica, Shannen Doherty, who initially is a shy bookworm with green as her signature color, (the other)Heather, and Winona Ryder as the popular girl constantly rocking blue clothing and is mature beyond her years, Veronica.

American actor Sasha Jenson was in his late 20s when he played Don Dawson -- the high school senior and football player always lookin' for a good time -- in the classic 1993 throwback film "Dazed and Confused."

Jenson shared the screen with Hollywood legends like Matthew McConaughey as David Wooderson, the suave Texas teen always ready to party and known for his catchphrase "All right, all right, all right."

Other notable players included Jason London who played Randall "Pink" Floyd, the footballer who floats between the stoners, geeks and jocks, and Ben Affleck as the high school bully, Fred O'Bannion.

American actress Clea DuVall was 21 years old when she played Graham -- the tough, cool and gay girl who is sent to conversion camp by her parents -- in the comedy/romance film "But I'm A Cheerleader" -- back in 1999.

Clea shared the big screen with Natasha Lyonne as Megan, the popular cheerleader who is a lesbian, also sent to the conversion camp, RuPaul as Mike, the formerly gay man who teaches manly "things" at the conversion camp, and Cathy Moriarty as the strict camp-director, Cathy.

DuVall's other notable works include "The Faculty" and "Girl Interrupted."

American actress Edith Conn AKA "Didi" was in her mid-20s when she skyrocketed to fame playing Frenchy -- the high school senior and 'beauty school dropout' who mistakenly dyes her hair hot pink -- in the 1978 musical/comedy film "Grease."

Edith shared the big screen with Hollywood legends like John Travolta as the hot and suave leader of the T-Birds, Danny Zuko, Olivia Newton-John as the new and naive girl at school, Sandy and Michael Tucci as Marty's silly, goofy boyfriend and part of the T-Birds.

Other honorable cast mentions include Stockard Channing as Rizzo!

"Beauty school dropout, no graduation day for you!"