Guessing Game...

I'm usually pretty good at these but I'm at a loss today...can any of you help me out?!?!

Which rapper who's uncooperative with cops is also uncooperative with cocktail waitresses? He doesn't like to tip . . .

Maybe DMX. Is he even out of jail?

Which female head of a cosmetics company used to be a man? Company employees watched the executive as, "first he wore more feminine suits, then switched to full-on dresses and then got the ultimate cut," said our spy . . .

Which married artist should tell his girlfriend to tone it down? The socialite has been shopping all over town, ringing up huge bills on his credit card and telling everyone about their affair. [source]