The Empire Strikes Back was released in the U.S. 30 years ago this week. On Wednesday, some of its stars (and friends) attended an anniversary screening.

See, Empire Strike Back Xbox Live Avatars aren't the only 30th anniversary happening for this sci-fi classic. The Wednesday screening was a benefit for St Jude Children's Research Hospital and took place in Los Angeles at the Arclight Theater.

(Pics by Angela Weiss, Getty Images Entertainment)

The Empire Strikes Back Cast Reunited, Partially

Billy Dee Williams (Lando!), Harrison Ford (Han!), Peter Mayhew (Chewie!) and Ewan McGregor (Ben Kenobi?). Note the lightsaber walking stick.

The Empire Strikes Back Cast Reunited, Partially

Also at the premiere were Cat Taber and James Arnold Taylor, voice actors for Padme and Obi-Wan Kenobi in the Star Wars: The Clone Wars series

The Empire Strikes Back Cast Reunited, Partially

And what would make an Empire Strikes Back event complete without Ashlee Simpson and Pete Wentz?