Credit: Jordan Strauss/WireImage

At her first public appearance since filing for divorce from Pete Wentz, Ashlee Simpson had a man by her side. . . a little one.

Simpson, 26, brought two-year-old son Bronx to the Milk & Bookies 2nd Annual Story Time Celebration in L.A. on Sunday. (Though she posed for a few pics, she didn't do any interviews)

Citing "irreconcilable differences," the Chicago actress filed for divorce in February. She and Wentz had been married since May of 2008.

"Ashlee's been my best friend for five years," Wentz told Ryan Seacrest on his KIIS-FM radio show March 14. "I have nothing but love and respect for her."