Mila Kunis arrives for the premiere of "Ted" on June 21, 2012 in Hollywood, California. Credit: Jeff Kravitz/FilmMagic

Lazy Sunday? Not so much for Mila Kunis.

A recent incident put a serious damper on the Black Swan star's Sunday afternoon plans with a friend, Page Six reports. The two women -- along with up to 10 others -- got stuck in the elevator of a New York City building for almost an hour.

"They were stuck in the elevator for 45 minutes and it became very hot in there," a witness told Page Six Wednesday.

Luckily, Kunis, 29, and crew kept their cool. "Mila and everyone else remained calm," the source adds. "There were firetrucks outside, and firefighters helped them get out."

Kunis (who's now dating Ashton Kutcher) is currently filming The Angriest Man in Brooklyn in NYC, alongside Robin Williams.