Lindsay Lohan, Rachel McAdams, Tina Fey, Amanda Seyfried, and Lacey Chabert reunited in a special interview with Entertainment Weekly to talk about their 2004 hit film "Mean Girls."

Written by Fey and directed by Mark Waters, "Mean Girls" features the story of teenager Cady Heron (played by Lohan) and her struggles with high school social cliques. Cady, being a new student at the school, started hanging out with the Plastics, a group of nasty girls consisting of queen bee Regina George (McAdams), insecure Gretchen Wieners (Chabert), and dim-witted Karen Smith (Seyfried).

"Mean Girls" was such a huge hit to the public, earning $120 million worldwide when it was released in theaters on April 30, 2004. Now, on its 10^th anniversary, the lead actresses of the film dished to Entertainment Weekly about never-before-revealed details and behind-the-scenes stories.

Check out five of the actresses' biggest revelations below.

1. Lohan and Seyfried wanted to be Regina, McAdams was going for the role of Cady, and Chabert thought she's wrong for Gretchen

Lohan exclusively told Entertainment Weekly that she had to fight Waters for the casting of the movie. The actress, back then, wanted to be Regina. According to Lohan, she played unpopular lead characters on her previous films "Confessions of a Teenage Drama Queen" and "Freaky Friday." She wanted to be the cool girl on set for a change. But Waters convinced her against it, saying, "No, Cady is the heroine, and that's who you are."

McAdams, who was 24 or 25 years old during filming, had a different plan in mind. Originally, she auditioned for Cady, Entertainment Weekly noted. But Waters said that Cady should be younger than the rest of the girls, which was perfect for then 17-year-old Lohan. According to McAdams, Waters told her, "I see Cady a little bit younger, but I think it makes sense if Regina kind of grew up a little too fast."

Fey revealed to Entertainment Weekly that Waters, along with executive producer and "Saturday Night Live" creator Lorne Michaels, told her that Cady would eventually turn into Regina. "You work backward from that and you cast her as Cady, knowing she could get to that point of being Regina, but you let her be the innocent side, too," Fey added.

Seyfried, on the other hand, also auditioned for Rachel. When asked to play Karen, the actress told Entertainment Weekly that she "just wanted to be in the movie." "Mean Girls" was Seyfried's first big break on the screen.

Chabert, however, loved her character Gretchen's insecurity. "I thought I was really wrong for Gretchen. The character description physically was very different from me. [She] was supposed to be really gangly," Chabert said, according to Entertainment Weekly. "I loved how insecure she was."

2. Fey somehow regrets not doing a "Mean Girls" sequel

Fey said that there really was no planned sequel for the film, and it's too late to do one now. "At the time we did want to start the conversation about the sequel, and for whatever reason I was like, 'No!!! We shouldn't do that!' Now I look back and I'm like, 'Why?' But now, no-it's too late now," Fey said, as quoted by Entertainment Weekly.

3. Glenn Cocco is a real person

"You go, Glen Cocco!" "Four for you, Glen Cocco!" Do you remember these famous catchphrases from "Mean Girls?" Well, it turns out that Glen Cocco is based on a real person - of the same name.

According to Fey, who also played Math teacher Ms. Norbury in the movie, "I tried to use real names in writing because it's just easier. My older brother's good friend is Glenn Cocco. He's a film editor in Los Angeles, and I imagine it's a pain in the butt for him," as reported by Entertainment Weekly.

4. The story on how production got Amy Poehler's pet Chihuahua to bite her nipples

Poehler, who played Regina's mother in the film, had to have a piece of cocktail wiener pinned into her bra for one of the crucial scenes.

"I thought this dog was going to tear her apart. It was very effective. She was such a pro through it," McAdams told Entertainment Weekly. "She's trying to do her lines and being so professional, and this dog is chomping on her fake boob. I'll never forget that," the actress added.

Seyfried also revealed that that particular scene was one of her favorites in the film.

5. When asked about what they think their characters are doing now, the actresses said...

"Karen would manage or own a store that sells really cool dog attire, like Swarovski dog collars and Halloween costumes for animals," Seyfried said, according to Entertanment Weekly.

Chabert thinks Gretchen is probably running the Toaster Strudel empire now and is now a happy wife and mother.

Lohan believes "Cady's with Oprah in Africa working at children's schools with a family, teaching girls to be nice to each other," while McAdams thinks "Regina is a Real Housewife. She'd have too much time on her hands, for sure. She's probably found all her other Reginas."