The 31-year-old - who shares sons Rocket, three, and Racer, two with Sam - said her eldest boy took the adorable snap, writing: 'Photo by Rocket.'
The pair celebrated their fourth wedding anniversary in December.
Lara celebrated the milestone by sharing a photo of a white fondant cake marked with 'Happy 4th Anniversary' on her Instagram Story.
The pair recently relocated their family from New York to Los Angeles to accommodate Sam's filming schedules for the hit flick Avatar 2 and 3.
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