McEntire will play Charlotte, Bonnie's (Peterman) best friend and partner in crime who first met in the maternity ward when they were both giving birth. But when Charlotte visits Bonnie in New York, it seems she might not be the supportive friend everyone thinks she is. The episode will air later this year.
McEntire and Peterman's WB sitcom lasted for six seasons before the CW, who broadcast the final season, cancelled it in 2007.
"Baby Daddy" airs on Wednesdays on ABC Family.