Hilary Duff Kisses Boyfriend Matthew Koma During Tropical Getaway -- See the PDA Pic!

The couple has been vacationing in Costa Rica.

Hilary Duff and Matthew Koma are Instagram official!

The 29-year-old actress got steamy with her new beau for their first Instagram snap together, posted on Thursday.

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Duff and Koma, who have been vacationing in Costa Rica, lean in for a kiss while touring a tropical jungle.

"????????," she captioned the pic.

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The pair was first linked in January, just one month after the former Disney star split with trainer Jason Walsh. In a recent interview with Cosmopolitan, Duff revealed that she had been dating Walsh for a lot longer than their five months in the public eye, and that is was "serious."

"We were seeing each other for a while," Duff told the magazine. "People don't know the ins and outs of everything. It was definitely my first more serious relationship since my ex-husband [Mike Comrie]."

"I was like, 'F**k it. He's my boyfriend,'" she said about her decision to go public. "I just needed to make sure it was right. People don't need to know my business until I really know my business, you know?"

See more in the video below.