Simpson holds tight to son Bronx, 2, who sips on a smoothie in L.A. Plus: Robert Pattinson, Shia LaBeouf, Justin Bieber and more

JOINED AT THE SIP

Ashlee Simpson may have a new guy in her life, but her main man remains to be 2-year-old son Bronx, who cools down with a smoothie in Los Angeles on Tuesday.