Miley Cyrus 'Laughing' Off Breakup on Set

Miley Cyrus 'Laughing' Off Breakup on Set
Miley Cyrus

08/27/2010 AT 11:15 AM EDT

Miley Cyrus isn't sad about her recent breakup from Liam Hemsworth. Quite the opposite: she's laughing it off – really.

Cyrus, 17, is busy at work on a new movie, LOL: Laughing out Loud, filming in Detroit. The comedy, about a teenage girl, her friends and dating in the age of Facebook, also stars Demi Moore, who plays Cyrus's mother.

Cyrus and Hemsworth, who costarred in The Last Song, dated for over a year, but they were plagued by occasional breakup rumors as recently as June. Still, Cyrus denied that there was trouble at the time, telling fans they were "so happy."

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