Selena Gomez, Cory Monteith Cop To 'Monte Carlo' Sing-Offs

'I feel like we were very annoying to people on set,' co-star Leighton Meester tells MTV News.

Selena Gomez's When the Sun Goes Down was released on Tuesday, but the star isn't just celebrating a new album this week. She heads back to the big screen with a leading-lady role in "Monte Carlo."

In the movie opening this weekend, Gomez plays not one, but two characters: an American teenager, Grace, and British heiress Cordelia, which required the Disney actress to take on an English accent.

"I did about two weeks [of training] before the film," Gomez told MTV News of learning the accent. "It was really fun [but] I was really nervous."

And the fun didn't stop there. Gomez also bonded on the set with her "Monte Carlo" co-stars, including "Gossip Girl" star Leighton Meester, who plays Gomez's stepsister; Katie Cassidy; and "Glee" heartthrob Cory Monteith, who had the tough job of working alongside some of Hollywood's most beautiful ladies.

"Going to hang out with a bunch of hot chicks in Europe? Sign me up!" Moneith laughed when we asked what attracted him to the role. "It was a no-brainer. They approached me to do a movie, and I heard [article id="1662825"]Selena Gomez wanted to do it[/article] and shoot in Europe."

The cast spent two months filming overseas, primarily in Monte Carlo and Paris, and they had as much fun onscreen as they did off.

"We sang a lot," Gomez said of her castmates.

"I feel like we were very annoying to people on set," Meester added.

Of course, considering Monteith, Meester and Gomez are all singers, it's hard to believe anyone found them "annoying." So what was their song of choice?

"[We sang] to actual songs that were out," Gomez said. "But we would create our own lyrics; it was really fun."

"There was a little jumping and jiving," Monteith admitted. "We were so taken away by the moment, shooting in Paris, shooting the Eiffel Tower," he speculated about what may have inspired all that singing. "It was incredible."

Check out all of the stars in action when "Monte Carlo" hits theaters on Friday.

Check out everything we've got on "Monte Carlo."

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