Little rock star Ryder rang in four-years-old with a new mini-girlfriend in his life and his mom by his side in Santa Monica this weekend. He kept it hardcore with a birthday bash at the petting zoo with some friends, but was too wiped out from all the partying to be out and about with Kate on Monday morning. Instead, she was out shopping and taking dance class with some friends. I'm sure her little man will be back by her side soon, though, because while she's got her flirty friends, he's the No. 1 guy in her life these days.
To see more of Kate and Ryder's weekend just