Lindsay Lohan’s baby sis promoted her new E! reality series on Tuesday’s Letterman. Check out this video clip of fourteen year old aspiring star Ali Lohan on the Late Show With David Letterman. You can catch Ali and her momanager Dina Lohan’s quest for superstardom on E!’s Living Lohan Mondays at 10 p.m. Living Lohan debuts Monday, May 26th.