Britney Spears sparks health concerns with worrying birthday 'nip slip'

Britney Spears has sparked fresh health concerns with a worrying 'nip slip' moment while on a birthday trip to Cabo. The pop icon was seen popping some sort of pill and washing it down with a drink earlier, though it was unclear what the pill was. Britney spent much of her time at the resort with a mystery tattooed man.