1018_pratt_launch Baby Jack Pratt is getting so big!

Chris Pratt just returned home from filming "Guardians of the Galaxy" in London, and shared the cutest picture of his son Jack on Thursday.

Christ tweeted, "Home at last," along with the sweet picture of Pratt holding his little guy over his shoulder.

The actor and wife Anna Faris celebrated Jack's first birthday back in August with a trip to the Farmer's Market in Studio City -- and he's already gotten bigger since then!

The happy baby definitely looks like his famous mommy -- they both have the same big smile. Click "Launch Gallery" above to see more cute celebrity kids!

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