Hot Mama! Check Out No Doubt Lead Singer Gwen Stefani's Rocking Abs!

We can't believe Gwen Stefani is 43!  The leader singer of No Doubt looked amazing last night when she performed on Jimmy Kimmel Live in Los Angeles. The mom of two showed off her toned tummy on stage then signed autographs for some lucky fans after. Keep it up Gwen. You look HOT!