Oldest son of Britney Spears and Kevin Federline, Sean Preston, 2 1/2, was seen leaving a kid's museum in LA a few days ago, with his nanny.  He sure loves his sippy cup!  Sean and younger brother, Jayden James, posed for pictures for OK! magazine with their mom recently.  It was the first time in 2 years that Brit had given an interview.

More photos of Sean P after the jump!

Brit Brit sure makes cute babies!

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