Kevin Federline britney spears hat jeans fat Sean Preston

Kevin Federline must be enjoying the role of Mr. Mom! Here's Britney Spears' ex taking Sean Preston to the dentist in Calabasas. Hey, mama's been busy in the studio!

Looks like KFed has put the dancing on hold, and in the process, packed on more than a few pounds. They don't call him "Big Daddy" for nothing. What happened to all the weight he lost on Celebrity Fit Club? C'est la vie!

Check out Sean Preston showing off his red grill. Such a cutie!

Kevin Federline britney spears hat jeans fat Sean Preston

Let's hope Lil' Sean doesn't one day want a gold grill. Save those flashy mouthpieces for Lil' Wayne!