Katherine Heigl, Sharon Lawrence

On the heels of Tyne Daly paying Seattle a visit as Derek's mother, Grey's Anatomy fans are about to meet another main character's mom.

Sharon Lawrence, who is best known for her run on NYPD Blue and who most recently played parent to Privileged's JoAnna Garcia, has been tapped to guest-star as Izzie's mother, TVGuide.com has learned exclusively.

As Grey's winds down its current season — and as Katherine Heigl's character, freshly diagnosed with metastatic melanoma, comes to terms with her mortality — Lawrence will appear in a late-April episode.

Will ailing Izzie welcome her mother with open arms? Um, do you watch Grey's Anatomy with any regularity? No, sources tell me that when Mama Stevens shows up at Seattle Grace, Izzie will be less than comforted by the unexpected visit.

For the scoop on another parent showing their face at Seattle Grace, watch this week's Mega Minute.