Credit: Randy Holmes/ABC

The Grey’s Anatomy cast is whole again! New moms Ellen Pompeo and Katherine Heigl returned to work on the show this week, PEOPLE has learned.

“They’re both back at work and everyone’s really happy to see them,” says a show source.

Pompeo, who welcomed Stella Luna Pompeo Ivery on Sept. 15, won’t be absent from any episodes of the show thanks to the production team’s planning ahead for the actress’s maternity leave by pre-taping Meredith’s scenes.

After adopting 10-month-old baby Naleigh on Sept. 10 — and taking five weeks off to film the romantic comedy Life As We Know It — Heigl also returned to the set this week. Heigl’s character Izzie will return to Seattle Grace in the episode airing Nov. 12, the same episode where guest star Kim Raver will begin her stint on the show.

No word on whether or not Stella and Naleigh have come to work with their moms yet, but if Chyler Leigh‘s experience with 5-month-old Anniston is any indication, they’re more than welcome on the family-friendly set. “My trailer is overtaken by kid’s stuff. Anniston has a buzzy chair, diapers, wipes, formula, toys,” she told PEOPLE in August. And the cast takes to it well, too. “Justin Chambers crowned Anniston baby Elvis because of her mowhawk!”

One thing is for sure — soon Anniston, Naleigh and Stella will have a new playmate: Eric Dane and his wife Rebecca Gayheart are expecting their first child together next year. –Lisa IngrassiaRandy Holmes/ABC