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

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.



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