Getty Images | Mike Marsland

15+ Celebs We Had No Idea Went To High School Together

It's the start of a new year, and you know what that means: High school reunions are going to be right around the corner— and with that in mind, we thought it would only be right to pay tribute to some of our favorite Hollywood high school squads.

From lifelong besties, to old flames, to mortal enemies who have hated each other longer than we thought, many of these pairs are unexpected.

The world really is a small place!

Camila Mendes and Dylan & Cole Sprouse.

YouTube | The Late Late Show with James Corden

Before Camila and Cole both ended up starring on Riverdale, they went to the same high school, along with Cole's twin brother, Dylan.

"[Cole] was a weirdo! He had really long hair down to his butt cheeks... I never got a chance to talk to him because he was more to himself." Camila told Office Magazine.

Azealia Banks and Nicki Minaj.

YouTube | MTV News

Azealia and Nicki both attended LaGuardia High School of Music & Art.

“I don’t remember Nicki having the level of ambition Azealia manifested to me,” their mutual drama teacher told Vibe

Wiz Khalifa and Mac Miller.

YouTube | First We Feast

Wiz Khalifa and Mac Miller both went to Allderdice High School in Pittsburg, however, Wiz was four years older, so they didn't actually have a chance to cross paths in school.

Adele and Jessie J.

YouTube | Amarudontv

Adele and Jessie are both BRIT School for Performing Arts & Technology alumni, along with Leona Lewis.

Amy Winehouse also attended the same school, but years beforehand.

That's a lot of powerhouse vocalists under one roof!

Britney Spears and Alicia Keys.

YouTube | The Tonight Show Starring Jimmy Fallon

Britney and Alicia both attended NYC's Professional Performing Arts School. However, Alicia graduated two years ahead of schedule, at just 16 years old, and she was her class' [valedictorian](NYC's Professional Performing Arts School.)

Adam Levine and Jonah Hill.

YouTube | The Tonight Show Starring Jimmy Fallon

Adam and Jonah have been close friends since junior high, and both attended the same high school. Jonah even officiated Adam and wife Behati Prinsloo's wedding.

"Our dads met in the principal's office in junior high. We were in carpool, we lived at each other's houses." Jonah told E! News.

Nicole Kidman and Naomi Watts.

YouTube | The Tonight Show Starring Jimmy Fallon

Nicole and Naomi met at North Sydney Girls High School, and have been close friends ever since.

The two have both had incredibly successful acting careers, and still support each other to this day.

Kate Hudson and Zooey Deschanel.

YouTube | TheEllenShow

Kate and Zooey have crossed paths in their professional lives, but before that, they also went to the same high school, Crossroads School for Arts & Science.

Matt Damon and Ben Affleck.

YouTube | The Late Show with Stephen Colbert

Matt Damon and Ben Affleck have been not only known for being amazing actors but also, best friends.

The two both attended Cambridge Rindge and Latin School in Cambridge, Massachusetts.

Lady Gaga and Nicky Hilton.

YouTube | Good Morning America

Lady Gaga attended NYC Catholic school, Convent of the Sacred Heart with both of the Hilton sisters, although, Paris was a few years older, and ended up dropping out.

"[The Hilton sisters] are very pretty, and very clean. Very, very clean." Gaga told About.

Rachel Bilson and Kirsten Dunst.

YouTube | Access

Aside from both being actress', these two ladies have something else in common. Rachel and Kirsten both went to Notre Dame High School in Sherman Oaks, in California.

Robert Downey Jr. and Charlie Sheen.

YouTube | The Tonight Show Starring Jimmy Fallon

Back in the '80s, these two both attended Santa Monica High School, along with other famous members of their clique, Robe Lowe and Sean Penn.

"We went to a big high school, and I can remember Charlie, for some reason, was wearing a bulletproof vest to school because he thought the gangs were going to get him." Rob Lowe wrote in his autobiography, [Stories I Only Tell My Friends](Stories I Only Tell My Friends).

Cameron Diaz and Snoop Dogg.

YouTube | The Tonight Show Starring Jimmy Fallon

Cameron and Snoop Dogg both went to Long Beach Polytechnic High School in California.

"She ran with my homegirls, all my little cheerleading homegirls... She was fly and she was hip." Snoop told Yahoo Music back in 2013.

Zach Braff and Lauryn Hill.

YouTube | Jimmy Kimmel Live

Zach Braff and Lauryn Hill both attended Columbia High School together in Maplewood, in New Jersey, where they were very good friends before becoming big stars.

Fun fact: SZA also attended the same school, later on.

Tupac and Jada Pinkett Smith.

YouTube | Hip-Hop Universe

Tupac and Jada were supposedly friends, that clicked right instantly after meeting on the very first day of school, at The Baltimore School of the Arts.

Freddie Prinze Jr. and Neil Patrick Harris.

YouTube | The Late Night Show With Jimmy Fallon

Freddie and Neil are most definitely cut from the same cloth —that cloth being La Cueva High School in Albuquerque, in New Mexico.

Kerry Washington and Gwyneth Paltrow.

YouTube | ABC News

Both of these actresses' spent their high school days attending the prestigious Spence School in NYC.

Although the two weren't actually friends, Kerry told Jimmy Kimmel that she always thought highly of Gwyneth.

Scarlett Johanson and Jack Antonoff.

YouTube | The Late Show with Stephen Colbert

Scarlett and Jack both attended the Professional Children's School in Manhattan, and they even dated for a short while.

The two still remain friends.

Rachael Leigh Cook and Josh Hartnett.

YouTube | TODAY

You probably remember these two from your favorite late '90s and early 2000's flicks. Well, turns out, they also went to the same high school, Minneapolis South High School, in Minnesota.

Robert Pattinson and Tom Sturridge.

YouTube | The Tonight Show Starring Jimmy Fallon

These two British actors, who would later go on to be the best of friends, started out at the same Harrodian School, in London.

Jason Momoa and Brandon Routh.

YouTube | IGN, Getty Images

Who would've thought that Superman and Aquaman went to the same high school? Small world.

Although Jason is all the way from Hawaii, he and Brandon both went to Norwalk High School in Iowa.

Timothée Chalamet and Ansel Elgort.

YouTube | The Tonight Show Starring Jimmy Fallon

Timothee and Ansel both attended LaGuardia High School of Music & Art and Performing Arts in NYC.

Ansel posted a photo on along with some of his alumni pals.

Matthew Morrison and Kristen Bell.

YouTube | Loose Women

Matthew and Kristen met at NYU's Tisch School of the Arts.

"We actually dated very briefly, so I'll have to say maybe Matt Morrison is my favorite part of Glee for various reasons," Kristen told US Magazine.

B.J. Novak and John Krasinski.

YouTube | TheEllenShow

B.J and John aren't just The Office alumni, they also both attended the same high school at the same time, Newton South High School in Newton, Massachusetts.

Matthew Perry and Justin Trudeau

YouTube | Late Night With Jimmy Fallon, Instagram

Okay, this pairing actually went to elementary school together, but Matthew has admitted he and a friend tried to beat the future Prime Minister of Canada up for being better at a sport. Justin was in third grade, while Matthew was in fifth, and Matthew said, "I think he was excelling in a sport that we weren't, so it was pure jealousy."

Rami Malek and Kirsten Dunst

Instagram | @ramimalek, @kirstendunst

The Mr. Robot star and future Mary-Jane Watson also attended the same high school! Rami said they took a musical theater class together at Notre Dame High School, and that he ""used to have a little crush on her."

Jennifer Aniston and Chaz Bono

YouTube | Chelsea, Instagram

The Friends star and Cher's son both attended the LaGuadia High School of Performing Arts together! Jennifer has said herself and her friends would go to Chaz's house after school almost every day.

Eddie Redmayne and Tom Hiddleston

YouTube | The Upcoming, Instagram

Eddie and Tom attended Eton College together in England, and were even in a performance together! Tom said he was "delighted tor eveal that I played the front right leg of the elephant that Eddie was riding on."

Eddie Redmayne and Prince William

YouTube | The Ellen Show, Instagram

Also attending Eton College was Prince William! Eddie revealed that they played on the same rugby team, and said, "I always felt slightly sorry for him because everyone wanted to tackle the future king of England. He took all the hits."

Meghan Markle and Katharine McPhee

Instagram | @sussexroyal, @katharinemcphee

The future duchess of Sussex and singer Katharine McPhee both attended Immaculate Heart High School in Los Angeles, and they were both quite musical! Katharine said, "I don’t know if there are videos of her singing, but she’s a really good singer.”