It was always considered a strange, unwritten rule: when casting a baby or small child in a role in Hollywood, it was always easier to just cast twins in the same role. Why? Because if one wasn"t doing what the producers and/or directors wanted, then the other could. One baby simply won"t stop crying? Well, we have a spare! That and child labor laws prevented child actors from working over a certain amount of hours. Sometimes, the celebrity twins continued to stay in the spotlight while growing up and went on to become super famous

Like Mary-Kate and Ashley Olsen (find out where the twins rank in terms of movies and TV on IMDb), who profited so much from playing Michelle Tanner on Full House that they literally built their own empire and retired young. Who are some other twins who have stolen our hearts while in the spotlight? Here are 10 of our favorites.

Related: Which Twin Is Richer: Tia Or Tamera Mowry?

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10 Dylan And Cole Sprouse

They crashed into everyone"s lives when they starred alongside Adam Sandler in Big Daddy and then blew everyone out of the water with their performances in the Disney Channel"s The Suite Life of Zack & Cody and its follow-up The Suite Life on Deck. 

Now, in addition to being super wealthy, Cole plays Jughead Jones on the series Riverdale and Dylan landed a nice role in popular After movie series. These two aren"t the only former Disney Channel stars still making waves today, too.

9 Mary-Kate And Ashley Olsen

They got their start by playing baby Michelle Tanner on Full House and not only stole Uncle Jesse"s heart, but the hearts of fans everywhere. And what happened to them? They are now super successful fashion designers who are living up their lives all over the world. They also became some of the youngest people to be named among the entertainment industry"s wealthiest members.

Related: "WandaVision" A New Superhero Team Is Assembling

8 Tia And Tamera Mowry

You might remember these gorgeous faces from the popular "90s sitcom  Sister, Sister that ran for a successful six seasons. The duo also formed a singing group in the "90s called Voices. Tamera is now on a Hallmark Channel show Home and Family. Both are extremely popular on social media and post adorable pictures supporting each other as they raise their children.

7 Brittany And Cynthia Daniel

Both Brittany and Cynthia are best known for playing sisters Elizabeth and Jessica Wakefield in the Fox series Sweet Valley High, which was a show based on the popular young adult book series of the same name by author Francine Pascal. Cynthia retired from acting and became a photographer, while Brittany still acts.

6 Jonathan And Drew Scott

You might know this famous set of twins from the popular HGTV show The Property Brothers, which teams up real estate guru Drew with his licensed contractor brother Jonathan and together, they help families find, buy, and fix up houses into their absolute dream homes. These brothers" charming chemistry jumps off the screen and make their shows all the greater to watch.

5 Charlie And Max Carver

These two very handsome actors are often seen as inseparable (even though, yes, they have appeared in things apart, like Charlie with his Broadway work). But we do love when Max and Charlie Carver appear together, just take a look at their work in Desperate Housewives, Teen Wolf, and The Leftovers (want to learn what went on with the karaoke scene in The Leftovers?)

Related: What Happened To Oliver And James Phelps After Harry Potter?

4 Aaron And Angela Carter

Not every twin relationship on this list is harmonious. Take, for example, Aaron and Angel Carter, who filed restraining orders against each other, according to TMZ. After Aaron filed one against his sister after he was diagnosed with schizophrenia and bipolar disorder, she turned around and did the same thing to him. Yikes!

3 Benji And Joel Madden

First, they were known for being two parts of the punk rock band Good Charlotte in the 2000s, and now, Benji and Joel Madden are largely known for their much more famous wives, Nicole Richie and Cameron Diaz (take a look at some of Diaz"s most famous roles).

2 Harry And Luke Treadaway

While they"re known together as a pair, both Harry and Luke Treadaway have also become known for roles they"ve taken apart. Like Harry, who is known for his role as Victor Frankenstein in Penny Dreadful, while Luke is prone to stick to the English stage.

1 Shawn And Aaron Ashmore

Millennials will know the Ashmore twins from the 2000s CW series Smallville, where Aaron played the reoccurring character Jimmy Olsen and then went on to play in the popular Canadian series Killjoys. Brother Shawn is known for the series The Rookie and also his part in the video game Quantum Break. 

Next: 10 Celebrities Who Have A Non-Famous Twin

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