07/09/2012 06:06 pm ET

Hilary Duff's Baby Luca Wears Cool Sunglasses (PHOTO)

Penelope Scotland Disick may be Hollywood's newest star, but we think Luca Cruz Comrie is the coolest baby on the block.

Hilary Duff tweeted a sweet photo of her baby boy on Monday just casually chilling in a pair of super-cool sunglasses.

"Back from beautiful Napa Valley now packing for NYC! This baby is world traveling!" Duff tweeted, and she wasn't joking. He's not even 4 months old and he's already quite the traveler. In late June, Duff joined Luca, her sister Haylie and other family members in Mexico for some beach time and R&R.

Check out Duff's adorable photo of Luca below:

Celebrity Kids: Out And About


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