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Lilo's little sis is NOT just an up-and-coming reality show star (in the upcoming Living Lohan on E!), she'll also try her hand at acting on the big screen in her first feature film, Mostly Ghostly, according to People.com. Can you say Freaky Friday?!

The movie's based on the book series by the same name, written by R.L. Stine about an 11 year-old boy who makes friends with ghosts. Ali will play a high school senior and the film will hit theaters later this year.

Ali could be a triple threat to her older sis ... she's also recording a new album!!!