Sandra Bullock & Louis: Levi McConaughey's Birthday Party!

Sandra Bullock dons short shorts while carrying her son Louis while heading to a birthday party on Saturday (July 6) in Malibu, Calif.

The 48-year-old actress was celebrating Matthew McConaughey‘s son Levi‘s birthday.

PHOTOS: Check out the latest pics of Sandra Bullock

Earlier in the week, Sandra was spotted arriving at LAX Airport after promoting her latest film The Heat in Australia.

It was recently announced that Sandra‘s upcoming film Gravity, also starring George Clooney, will be premiering at the 2013 Venice Film Festival.

30+ pictures inside of Sandra Bullock and Louis attending a birthday party…