Credit: Twitter

LeAnn Rimes shouldn't be surprised if she ends up on Santa's naughty list this Christmas.

Dressed in a cleavage-baring Santa suit, the 28-year-old singer had tongues wagging when she performed with the Gay Men's Chorus of L.A. Sunday. "Mrs. Claus at your service!" she tweeted.

"I just got pinned by the Gay Men's Chorus Of L.A.!" Rimes added. "I'm an honorary member now...head Queen!"

But the night wasn't just about showing off her curves in a festive costume: the "Swingin'" singer was also there to support the LGBT community.

"Wow, a beautiful night! My heart broke and I almost couldn't sing as I spoke about the young gay men and women who have taken their lives this year," she tweeted after the show. "It gets better!"