It was a tale of two Simpsons at the Palms Place grand opening in Las Vegas this weekend.
Jessica and Ashlee Simpson-Wentz both came for the party, where Ash's hubby, Pete Wentz, was deejaying.
Ash was "glowing" as she sipped on water, says an eyewitness. Proud papa-to-be Pete even dedicated a song to "his baby mama" after his set, and the newlyweds looked lovey-dovey throughout the night.
Jess, however, looked less-than-thrilled to be there. "She didn't smile at all," says our source. Missing Tony Romo, maybe?