Jessica Ann Sierra (born November 11, 1985 in Tampa, Florida) is an American singer and was the tenth-place finalist on the fourth season of American Idol. She was the third finalist eliminated, on March 30, 2005.

Sierra is from Tampa, Florida, and auditioned in Orlando. She was also a contestant on Star Search before auditioning for Idol, and was a nanny. Sierra started singing in church at the age of 3. As a teenager, she performed for Presidents Bill Clinton and George W. Bush in singing and dancing ensembles. She first auditioned for Idol in the second season, but was rejected

She was eliminated on March 30, during 1990s music week after she sang LeAnn Rimes' "On the Side of Angels", surprising some fans since Simon Cowell had previously stated that she was one of the strongest female vocalists in the competition.