Michael's acting career started and ended after he briefly joined the former Disney darling on screen in her 1998 movie The Parent Trap - as a lost boy at her character's summer camp.
The 21 year old is now taking a break from school in New York to make a serious step toward Hollywood stardom.
At a press conference for her new shoe line, Lohan matriarch Dina accidentally confirmed her son is working on a new film.
She told WENN, "Lindsay's brother Michael is on academic scholarship at Ithaca (college). He's also doing a movie."