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Justin Bartha Is Dating Trainer Lia Smith (PHOTO)

HOLLYWOOD, CA - DECEMBER 02:  Actor Justin Bartha arrives to The Trevor Project's 'Trevor Live' event honoring singer Katy Pe
HOLLYWOOD, CA - DECEMBER 02: Actor Justin Bartha arrives to The Trevor Project's 'Trevor Live' event honoring singer Katy Perry at the Hollywood Palladium on December 2, 2012 in Hollywood, California. (Photo by Alberto E. Rodriguez/Getty Images)

Justin Bartha's "mystery woman" is in fact his girlfriend, trainer Lia Smith, a source reveals to PEOPLE.

The pair recently enjoyed a cozy trip to Smith's native Hawaii and were snapped basking in the sun on Maui on New Year's Day, which got people buzzing about her identity.

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