February 23, 2012 04:00 PM

Michael Kovac/WireImage

Caterina Scorsone and her husband, musician Rob Giles, are expecting their first child this summer.

“We’re over the moon,” the Private Practice star, 30, tells PEOPLE exclusively.

“I’m starting to show now. Everybody on set has been pretty sweet and is offering me fruit.”

On Thursday’s episode, fans of the show will learn that Scorsone’s character, Dr. Amelia Shepherd, is pregnant.

“This year Amelia — who had been sober — fell off the wagon after her friend died,” the actress explains of her character’s story arc. “She hit rock bottom, had an intervention and went to rehab. So this news is on the heels of that.”

Upon learning of Scorsone’s pregnancy, Private Practice creator Shonda Rhimes was inspired.

“The news came out of left field and I think she decided she could use this for dramatic purposes,” jokes Scorsone. “As an actress it never feels like the right time. But once we knew what was happening we were like, ‘This is perfect.'”

“Shonda was immediately excited and talked about what we could do when the baby came so [he or she] could be on set,” she continues. “She’s been unbelievably supportive.”

Maybe that’s because Rhimes thinks of Scorsone and Giles, who’s a member of The Rescues, as part of her extended family. Years before Scorsone joined the cast, the band’s music was featured on both Grey’s Anatomy and Private Practice, while Giles, 36, also worked with Grey’s stars Sara Ramirez and Kevin McKidd.

— Monica Rizzo

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