American Reunion's biggest stars Jason Biggs, Chris Kelin, Eugene Levy and Jennifer Coolidge stepped out for the film's final installment, on Wednesday evening in Austria.

The popular film franchise first hit theatres in 1999, but luckily the actors have all reunited for the 2012 American Reunion!

They haven't aged a bit!

Hard to believe we first met the cast of American Pie back in 1999! Now, the original cast is back for the new flick American Reunion.

Chris Klein, Shannon Elizabeth, Seann William Scott, Jason Biggs and a very pregnant Alyson Hannigan all hit the red carpet still looking sexy after all these years. Mena Suvari, Eddie Kaye Thomas and Tara Reid also made an appearance.

As you can imagine, the fans went wild as the stars arrived at the Grauman's Chinese Theatre in Hollywood.

Check out the below Twitpic of a tanned and gorgeous Tara Reid posing alongside the Jedward twins ... and an apple pie.

The movie hits theaters on April 6, and we can't wait!

Click thru to see the hilarious trailer.

J. Lo has warmed audiences on American Idol, but she's about to get cold: the diva has signed on to the new Ice Age movie.

In Ice Age: Continental Drift, out in 2012, Lopez will play Shira, a snow leopard.

Also new to the franchise are Jeremy Renner, who will play a character named Gutt, Drake as Ethan, Wanda Sykes as Granny and Aziz Ansari as Walter.

But familiar faces will be back; Ray Romano as mammoth Manny, Queen Latifah as Ellie, Dennis Leary as Diego, John Leguizamo as Sid, Seann William Scott as Crash and Josh Peck as Eddie.

J. Lo's participation in the film falls under an overall deal she signed with Fox to be a judge on American Idol. But she also has her own projects in the works; see what big announcement is coming Thursday after the jump!

Just one day after Seann William Scott announced, via his publicist, he is entering a treatment facility for "health and personal issues," it was confirmed today Scott will reprise his role as Steve Stifler in a new installment of American Pie.

Jason Biggs, Eugene Levy, Tara Reid, Chris Klein, Mena Suvari and Jennifer Coolidge are also in negotiations to return to the next film, so let's hope this one doesn't go straight to DVD!

Pie is set to begin production May 24. Scott's agent says his treatment will not affect production.

American Pie star Sean William Scott has entered treatment for "health and personal issues," his rep said in a statement today.

Scott, 34, is being treated at an undisclosed facility.

His publicist released the following brief statement: "Seann William Scott has voluntarily admitted himself for proactive treatment to address health and personal issues. He appreciates the support of his many fans at this time."

Poor Seann William Scott - he used to be such a hottie! The American Pie actor was spotted grocery shopping (hopefully for fruit and veggies) in Malibu on Monday and, unfortch, his bod is still wildly out of shape. Get to the gym ASAP!

Tracy Morgan (wearing Eddie Murphy's Delirious red leather suit) along with Bruce Willis, wife Emma Hemming and the film's Seann William Scott, attended the New York premiere of the film that's either gonna be totes hilar or totes hellacious, Cop Out.

But they weren't the biggest stars at the premiere: "Too fat to fly" Kevin Smith, the film's director, also attended the big premiere in NYC, probably on his free flights for life "I'm sorry" ticket from Southwest.

Sean William Scott (along with co-star Paul Rudd) posed for pics at the Madrid photocall for "Role Models" the other night. We know it's just a photocall, but couldn't Stifler have worn something a little bit snazzier?