Pink is scheduled to perform at Barack Obama’s fundraiser this week but she may be forced to cancel.

The singer is recovering from gallbladder surgery. She tweeted Sunday, “Oh, and P.S….F YOU gall bladder! SAYONARA!!!!!!!!!!!!” She had been admitted to the hospital for what was believed to be the stomach flu.

Pink’s rep tells E! News she is “recovering nicely”.

She wasn’t about to let her hospital stay get in the way of normal like, though. Pink celebrated her daughter Willow’s first birthday at the hospital. "Happy Birthday to my angel, my purpose, my biggest blessing. I love you Willow Sage," the singer tweeted, along with a photo of her daughter's first birthday cake. "Thanks family 4 bringing my lil girls party to the hospital all weekend for me. I spose it doesn't matter where u r when u eat ur 1st cake!"