Rihanna must have been on one.

"All these bitches screaming that 2Pac back #thuglife," the singer tweeted earlier today, while posting a picture of her new tattoo— the words "Thug Life"— on her knuckles.

She also tweeted a picture of her back being worked on, quoting Drake: "Tat my fuckin name on u girl so I know its real!!!"

Maybe we'll see the tattoo artist's handywork in some forthcoming twitpics?