Britney Spears didn't want nannies who were too good at their job – except when it came to checking her out in the buff.

As Brit continues her mad spiral in, out, in, and out of rehab, as TMZ reported yesterday, her former nannies are tattling on the pop princess to Us. For one thing, Brit apparently didn't care about whether the kids' nannies could actually change diapers or feed the babies, so long as they were "young and hip," says an Us source. When potential candidates were interviewed, their work-history or child-rearing skills were hardly even inquired about.

But if they got a little too good at their job, and got close to Sean Preston, they were shown the door, because Brit didn't want any competition. Plus, they also had to withstand her. "She stripped down naked in front of us," says another source.