The mother of two shows off her incredible figure in a strapless gown at sister Ashlee Simpson's August 2014 wedding to Evan Ross.
The mama-to-be was nine months pregnant with her first child when she attended friend Lauren Zelman's wedding at the Parker Palm Springs in March 2012.
Flashback! Then known as Mrs. Lachey, the blond beauty appeared at the Beverly Hills Presbyterian Church for Jennifer MacFarlane's wedding to Sean Sullivan.
The former Fashion Star judge served as a bridesmaid at BFF CaCee Cobb's wedding to actor Donald Faison.
At the nuptials of Kathryn Sykora and Chris Ketherington, the pregnant star joined sis Ashlee as a bridesmaid in a black gown.
She most recently walked down the aisle as a bridesmaid in her publicist Lauren Auslander's wedding.
PHOTOS: See Jessica's best style moments!