He refused to work with Madonna and the Simpson Sisters (Ashlee and Jessica) and talked **** about them during those weeks. He said he'd never work with them because Madonna was not professional (let's remember that she broke an arm because of riding a wild horse when the plans for the hung Up video were ready

) and the Simpsons didn't go to a photo shoot planed for Rolling Stone so he demanded them.
I dk about Xtina and Gwen... but Gwen did some videos with him...so... idk