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Also known as: Cady Heron
Where to begin? Lohan had a tumultuous decade with a personal life that became tabloid news, in between film projects such as A Prairie Home Companion and Machete. After six stints in rehab, she tried to revive her brand by appearing on the OWN network's docu-reality show Lindsay, which addressed her struggles with sobriety. She also had an April 2014 guest spot on the CBS sitcom Two Broke Girls.
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Also known as: Ms. Norbury
Tina Fey has been just about everywhere PMG (post-Mean Girls) — whether returning to her old Saturday Night Live stomping grounds as 2008 vice-presidential candidate Sarah Palin or winning every award out there for her show 30 Rock. Fey hit the big screen in 2014 with Muppets Most Wanted and This is Where I Leave You opposite Jason Bateman. She also created the upcoming NBC sitcom Tooken, starring Ellie Kemper.
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Also known as: Regina George
Thanks to The Notebook hitting theaters just a few months after Mean Girls, McAdams catapulted to the A-list. The rom-com queen has charmed audiences (The Time Traveler's Wife, The Vow, About Time), as well as directors Cameron Crowe and Wim Wenders, who gave her roles in an as-yet-untitled project and Every Thing Will Be Fine, respectively.
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Also known as: Aaron Samuels
Bennett's film Authors Anonymous, co-starring Kaley Cuoco, hit theaters and VOD in March 2014. He's also booked to host MTV's summer reality series CopyCat. ''It's a singing competition show where people come on to compete to be like their favorite artist. So it's like, 'I'm the best Justin Bieber!' 'No, I am!' Bennett explained to EW. ''It's like American Idol meets Tosh.0.''
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Also known as: Karen Smith
It's hard to believe Mean Girls was Seyfried's film debut, considering the success she's had since with Mamma Mia!, Dear John, and Les Misérables. Seth MacFarlane cast her for May 2014's raunch-com A Million Ways To Die in the West, and she has both Ted 2 and Peter Pan coming down the pike.
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Also known as: Gretchen Wieners
Chabert told EW she's ''really proud'' of Hallmark Channel's May 2014 original movie Color of Rain. ''Playing a real-life character is definitely a lot more responsibility than one that is fictionalized. I play a woman who loses her husband to cancer, and she has two children, and she meets a man who has just recently lost his wife to cancer that has three children. They find friendship and love and healing throughout the process of them coming together. It was really an honor to tell their story.''
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Also known as: Mrs. George
Post-SNL, Poehler found a beloved regular gig on NBC's Parks and Recreation, for which she won a 2014 Golden Globe (Leslie Knope forever!). In addition to being everyone's favorite awards show host opposite Tina Fey, Poehler also produces Parks and Broad City, among other projects.
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Also known as: Damian
''I'm attached to this new Broadway musical, which I'm really excited about,'' Franzese told EW. ''It's called Found. It's by Hunter Bell who did [Title of Show]. And then I just directed a feature documentary. It's called Allee Willis Loves Detroit. It's about this Grammy-winning songwriter who returns to her hometown of Detroit and writes them a theme song. We shot in 50 locations with thousands of people singing. It's really amazing and funny and heartwarming. I'm excited for people to see it. It's been a really good year.''
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Also known as: Janis Ian
After attaining cult fave status for her work on Party Down and indie films such as Bachelorette, Caplan booked a leading role opposite Michael Sheen on Showtime's 2013 series Masters of Sex. ''I didn't want to play the [character] who has all her s--- together, even though there are lots more roles for girls who have their s--- together,'' Caplan told EW. ''I like the angrier characters.''
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Also known as: Kevin G.
Outside of taking classes at the Upright Citizen's Brigade and shopping around a screenplay, Surendra tells EW he has one primary non-Hollywood passion right now. ''I'm also running a small business doing calligraphy which has been a passion of mine since I was a little kid,'' he explains. ''It's a lot of fun. I think I sometimes confuse people. I've been asked recently, 'Oh, you've given up acting for calligraphy?' In North American culture it's often expected of you to identify as one thing, but I live my life as an artist doing many different things in the arts. If I like a project then I immerse myself in it completely, whether that's acting, calligraphy, or pottery, painting, or sculpture.''
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Also known as: Principal Duvall
In addition to being the only cast member to reprise his role in 2011's television movie Mean Girls 2, the SNL alum has appeared on the big screen in Grown Ups and its sequel, and dropped by many popular sitcoms including Suburgatory and Bob's Burgers.