Ali Lohan, Lindsay's 14-year-old sister, has begun filming her first film project, Mostly Ghostly, in Los Angeles, PEOPLE has learned exclusively.
Ali's role shares similarities with her older sister's character in the 2004 film Mean Girls: She'll play "a popular high school senior" in the film, says a source.
Ali told Teen Vogue in the April issue, "I grew up watching Lindsay. It made me want to do what she does. Just the whole vibe. Being there, being on camera, or onstage."
The film, slated for release later this year, is based on the pre-teen book series Mostly Ghostly written by R.L. Stine, which centers on an 11-year-old boy who befriends two ghosts.
Ali, who has spent the past several weeks shooting her upcoming E! reality TV show with her mother Dina in New York City, Long Island and Las Vegas, is also recording a new album.