By peoplestaff225
Updated September 28, 2009 04:25 PM
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Out on a stroll in Los Angeles last weekend with husband Eric Dane, Rebecca Gayheart showed in public what the couple’s close friends have known for some time: that she’s expecting.

In February, Grey’s Anatomy star Eric, 37, told Ellen DeGeneres that he and Rebecca, 38, wanted a baby.

“They’re definitely happy,” a source tells PEOPLE. “They’ve been trying for so long.”

Reps for the pair have not commented.