Justin Bartha and his girlfriend, personal trainer Lia Smith, are engaged, reported People.

"They're very happy," a source told the magazine. The couple, who was first publicly linked this past January, were photographed together spending time in Hawaii on New Year’s Day. "They were very cute with each other," an eyewitness told People at the time. "They had their arms around each other and were kissing."

Bartha first met Smith at Equinox in Los Angeles during a Pilates session, and has been dating her for a substantial period of time, according to Us Weekly. He previously dated Ashley Olsen, 26, for two years, and has also been romantically linked to Scarlett Johansson, 28.

Bartha is perhaps best known for playing Doug in the Hangover movies, a role he’ll be reprising shortly in The Hangover Part III due in theaters May 23. He recently starred in the NBC sitcom the New Normal opposite Andrew Rannells.

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