Blair and her baby boy Arthur slide on by at a farmers market in L.A. Plus: Sandra Bullock & Melissa McCarthy, the Hemsworths, Rihanna, Justin Theroux and more

  • SLIP N' SLIDE
 photo | Selma Blair

Credit: Xposure

Published: Monday Jun 24, 2013 | 07:00 PM EDT

SLIP N' SLIDE

It's hard to tell who's having more fun as Selma Blair celebrates her 40th birthday with son Arthur (who turns 2 next month!) at the Studio City Farmers Market in L.A. on Sunday.