Kelli Berglund (born February 9, 1996[1][2]) is an American actress, model, dancer and singer.[3] She is known for portraying Bree Davenport…Kelli Berglund (born February 9, 1996[1][2]) is an American actress, model, dancer and singer.[3] She is known for portraying Bree Davenport, a bionic teenager with lightning speed, in the Disney XD series Lab Rats,[4][5] and its spinoff Lab Rats: Elite Force. In 2014 she starred in the Disney Channel Original Movie, How to Build a Better Boy, where she portrays Mae Hartley, a tech-savvy young woman who along with her best friend, devises a plan to create the perfect boyfriend.[6