AJ Michalka is teaming up with
Diane Lane and
John Malkovich on her newest movie, Secretariat!
The 18-year-old actress/singer tweeted, "I didn't wanna announce this until I started filming, some of you already figured it out...I'm working on a film called
Secretariat."
Secretariat tells the tale of
Penny Chenery, owner of the racehorse
Secretariat, who won the Triple Crown in 1973.
AJ dished on the film deets