Kardashian is all dressed up for the gym while out in L.A. Plus: Claire Danes, Lea Michele, Ian Somerhalder & much more

WHAT FLOATS HIS BOAT

We hardly recognize Simon Cowell without his signature black tee! The X Factor judge looks happy and relaxed Saturday (and almost gives John Stamos a run for his money!) while boating with girlfriend Lauren Silverman in Saint-Tropez, France.