Source: Kate Hudson & A-Rod Split

Kate Hudson and Alex Rodriguez have split, a source told Access Hollywood.

The “NINE” star and the Yankee slugger split about a week ago after they came back from a trip to Europe, the source said.

We’re told Kate, who was a regular fixture on the sidelines, cheering on A-Rod during the New York Yankees’ World Series victory, fought with Alex before and during the series. We’re told the two had a big fight because Kate wanted to go out and party and A-Rod did not. The source told Access that Kate stormed out of the apartment following the argument, but the two made up the next day.

The source described their relationship as “tumultuous,” noting it was full of ups and downs. A-Rod also reportedly did not like that Kate enjoyed partying so often.

The split will no doubt be difficult for their respective children. Kate’s son Ryder was — according to our source — already calling A-Rod “Daddy,” while Alex’s daughters really liked Kate.

A-Rod has now moved back to the Florida home he previously shared with his ex-wife, Cynthia, the source said.

Kate previously told Harper’s Bazaar – in a fashion special of the magazine just hitting the stands now, that she was “having a good time right now” with her life and love.

“And no matter how many times my heart breaks, I’ll never be any different,” she said. “I’d rather hang out with the person who’s done everything than who’s done nothing. It would suck to die and not have experienced my life, really.”