Singer Carnie Wilson has been diagnosed with a temporary form of facial paralysis called Bell's palsy.

The former Wilson Phillips star's left side of her face is affected. According to the Mayo Clinic, "Bell's palsy causes sudden weakness in your facial muscles. This makes half of your face appear to droop. Your smile is one-sided, and your eye on that side resists closing."

The condition is usually temporary and usually goes away within six months.

Wilson, 44, posted on Twitter: "Just wanted you all 2 know that I have Bell's Palsy on lf (left) side of face right now. Scary, unfortunate, but it goes away. A challenge! Love u."
She later tweeted, "I am listening to Frank Sinatra. Really calming. Ps Who believes in Acupuncture? I'm treating my Bell's Palsy with it. IT'S WORKING."

In 2012, Wilson underwent gastric bypass surgery for the second time in 12 years.  She told the "Today" show in April, "I've learned I've got to take care of my health. This is about health... It's about my lifestyle. I'm laying the groundwork for myself, for my future."