Britney Spears was in London last night to kick off the European leg of her world tour. She was able to have Sean Preston and Jayden James come along, and she even shared these videos of them dancing at a rehearsal. While she's overseas, Kevin Federline is coming to accompany their sons and apparently he's being paid around $30,000 for June, in addition to his rumored $20,000 a month in child support. It seems like an awful lot of money, so tell us — do you think K-Fed should get paid extra to watch his sons?