By Lynette Rice
Updated August 16, 2010 at 12:00 PM EDT

Image Credit: Gilbert Carrasquillo/Getty ImagesAnother member of the Brady Family will make an appearance in CBS daytime: EW has learned that Christopher Knight will play a pediatrician who will treat Bridget and Owen’s new baby on The Bold and the Beautiful. Knight, who portrayed Peter Brady in various Brady Bunch projects from 1969 to 1990, will show up on the sudser on Wednesday, Sept. 15.

On July 30, Knight’s longtime costar Susan Olsen tape her first scripted TV appearance in more than 10 years by playing Mrs. Liza Morton, a pre-school owner, for The Young and the Restless. Her episode will air Sept. 1.