Celebs Make Surprise Appearances at Disney’s D23 Expo 2011 (PHOTOS)

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It seems as though not every celeb was at the wedding of the summer on Saturday. Some of Hollywood’s biggest stars spent the day at Disney’s annual D23 Expo!

Jason Segel, Taylor Kitsch, Jennifer Garner and others were scheduled to appear during the expo’s special preview of upcoming feature films, but a few other special guests made their way to the Anaheim Convention Center in Anaheim, CA (home to the D23 Expo) to surprise the most devoted Disney fans. Who exactly were they?

None other than Hollywood blockbuster stars Chris Hemworth and Robert Downey Jr, and a little lady by the name of Scarlett Johansson — who showed up rocking a sexy orange minidress. Girl’s looking good!

Fans and staff alike were treated to a sneak preview of their next big films including the much anticipated The Avengers, which which crosses over several Marvel superhero films including Iron ManThe Incredible HulkIron Man 2Thor and Captain America: The First Avenger.

Although Chris Evans was noticeably absent from the event, he sure received a loud round of applause from all the Captain America fanatics.

Take a look through the gallery to see who else showed up to surprise Disney fans!