April 04, 2011 03:00 PM

Jackson Lee/Splash News Online

What gave him that grin?

Sasha Schreiber, 3½, cracks up while out for a walk with dad Liev Schreiber in New York City on Wednesday.

Earlier in the week, we spotted the actor’s fiancée Naomi Watts stealing a smooch from younger son Kai, 2!

RELATED: Liev Schreiber: Actors Make Amazing Parents

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