How many surprises are in store for the Oscar nominations?

Movie fans are eagerly waiting to learn Tuesday morning if “The Hangover” gets an Oscar nomination for best picture.

Don’t laugh.

The raucous R-rated comedy won the Golden Globe for best comedy or musical, and the screenplay is nominated for the Writers Guild of America top prize.

And with the Academy of Motion Picture Arts and Sciences expanding its best picture nomination list from five to 10, such highly commercial films as “The Hangover,” “Star Trek” and even “District 9” have a chance at the brass ring.

Still, there are just a few films that are considered front-runners for the 82nd Academy Awards, which will be telecast live March 7 on ABC from the Kodak Theatre in Hollywood: “Avatar,” “The Hurt Locker,” “Inglourious Basterds” and “Up in the Air.”

The nominations will be revealed at 5:30 a.m. Tuesday at the academy’s Samuel Goldwyn Theater in Beverly Hills, with last year’s lead actress nominee Anne Hathaway helping Oscar president Tom Sherak with the announcements.

Besides increasing its nomination list for best picture, the academy is also featuring two hosts for the Oscar ceremony: Alec Baldwin and Steve Martin, who just starred together in “It’s Complicated.”

susan.king@latimes.com