Get ready for Miley Cyrus, Serious Actress. Miley Cyrus is ready to leave her Hannah Montana/Miley Stewart alter ego in the dust and begin tackling more challenging roles — beginning with a part in the upcoming sequel to The Dark Knight.

America’s Most Famous Teenager is determined to play Batgirl in the follow-up to the Summer 2008 blockbuster, according to The Globe’s Loosch Lips Column.

Lordy, have we learned nothing from Alicia Silverstone’s disastrous performance as Batgirl in Batman & Robin? (Love Alicia Silverstone, but she just didn’t work for me as Batgirl.)

Spywitnesses say Miley “stunned” producers at Warner Brothers when she showed up at the Hollywood studio in full batsuit to pitch the idea of playing a crime-fighting sidekick to Christian Bale’s Caped Crusader.

“She was sort of hopping around the room and had even written some dialogue for herself,” says an insider. “The problem is, some people aren’t really convinced Miley has the acting chops to pull it of.”