Rihanna: I Have No Idea How I Keep Losing Weight!

Rihanna heads to Whole Foods to grab some groceries on Friday night (March 16) in New York City.

After shopping, the 24-year-old singer headed to a her Grandma’s birthday party in Brooklyn! “Me and gran gran Dolly gonna celebrate tonight! Happy burrday gyal!!!! 1Love #piscesrule” she tweeted.

Earlier in the week, Rihanna made an appearance on Ryan Seacrest‘s radio show and talked about her weight.

“It’s difficult to have any kind of routine when your schedule is that crazy. So I really have no idea how I’m continuously losing weight,” RiRi said about her weight loss (via Us Weekly).

“It’s actually pretty annoying. Now, I don’t have a butt, no boobs – already had no boobs…so annoying!”