Sara Gilbert is an American actress, director, and producer best known for her role as Darlene Conner in the ABC sitcom Roseanne. She also starred in the CBS comedy The Big Bang Theory as Leslie Winkle. Sara Bareilles is an American singer-songwriter and musician who achieved mainstream success with her 2007 hit single 'Love Song'. She has released six studio albums and won numerous awards, including a Grammy Award for Best Female Pop Vocal Performance.