Ashlee Simpson-Wentz

Darren/Fame Pictures

Ashlee and Pete Wentz's baby, Bronx Mowgli, is doing just fine.

After Ashlee canceled an appearance at the Eleven Spa Vegas party Wednesday, rumors flew that she stayed home because Bronx had broken his arm.

"It's not true," her rep said, adding that Ash was planning to attend but canceled due to scheduling issues. "Everyone is fine."

Instead of hitting the soiree in Sin City, where Eva Longoria Parker and Mario Lopez were hanging, Ash opted to stay local and grab sushi at Nobu with her girlfriends.

Also at the restaurant in Los Angeles, Brandy Norwood celebrating her birthday with brother Ray J, Lil' Kim and Diddy in attendance.