KATHERINE HEIGL honoured mother-to-be ELLEN POMPEO by throwing her a star-studded baby shower on Saturday (29Aug09).

KATHERINE HEIGL honoured mother-to-be ELLEN POMPEO by throwing her a star-studded baby shower on Saturday (29Aug09).

Heigl celebrated her pal’s journey into motherhood by inviting 25 friends, including their fellow Grey’s Anatomy co-stars Kate Walsh and Sandra Oh, to the outdoor bash held under giant umbrellas in the backyard of her Los Angeles home.

Pompeo, who is expecting a daughter in October (09) with husband Chris Ivery, was also joined by Rebecca Gayheart, the wife of her Grey’s co-star Eric Dane.

A guest tells People.com, “Ellen looked gorgeous in a white summer dress with her hair in a braided up-do. She seemed very excited to celebrate with her girlfriends.

“Pompeo, 39, was spotted preparing for the event by sharing special time with socialite Nicole Richie, who is also expecting.