Heavily pregnant Ashlee Simpson at the Studio City Farmers Market

R&B legend Diana Ross is a grandma again. Her son Evan Ross, 26, and his wife, singer Ashlee Simpson, 30, welcomed a baby girl on Thursday, Us Weekly reports.

Simpson has a 6-year-old son, Bronx Mowgli Wentz, with American musician Pete Wentz, 36, who has a 1-year-old son with his girlfriend.

“I told [Bronx] pretty early on,” Simpson told Us Weekly. “He wanted to have a sister, so he’s really excited! He’s got a little brother. Now he’s going to have a little sister!”

The baby is Evan’s first.

Photos: Wenn.com