Wilson, 44, tweeted about her condition March 14, reassuring fans that the disorder, which was affecting the left side of her face, would go away soon.
Calling it "scary" and "unfortunate," Wilson kept her spirits up with a positive attitude: "A challenge!" she tweeted.
Wilson said she was treating the palsy with acupuncture, and that she had dealt with the condition before, on the right side of her face.
"Remember I go public because its gonna help someone else with same thing," she wrote.
On Tuesday, 12 days after the diagnosis, Wilson said her smile was "70 percent back!" and that her kids were keeping her laughing.
The singer, daughter of Beach Boys star Brian Wilson, has often been public about her health issues, including a struggle with her weight.
Just wanted you all 2 know that I have Bell's Palsy on lf side of face right now. Scary, unfortunate, but it goes away. A challenge! Love u.— Carnie Wilson (@CarnieWilson) March 14, 2013
Ps Who believes in Acupuncture? I'm treating my Bell's Palsy with it. IT'S WORKING.— Carnie Wilson (@CarnieWilson) March 15, 2013
Today better. Xoxo to you al!!!— Carnie Wilson (@CarnieWilson) March 16, 2013
12 days out of Bell's and doing much better! All your wishes have warmed my heart & it's making me heal faster! Yay!!— Carnie Wilson (@CarnieWilson) March 19, 2013
Remember I go public because its gonna help someone else with same thing!! BTW- I had it on my rt side 14yrs ago!— Carnie Wilson (@CarnieWilson) March 19, 2013
A beautiful day to you allMy smile is 70% back!!Except when kids make me belly laugh! Lol they keep me laughing !! Luv to you all— Carnie Wilson (@CarnieWilson) March 19, 2013