Miley Cyrus Post-'Hannah Montana': What's Next?

Series finale of 'Hannah Montana' airs this Sunday.

It's hard to believe that after Sunday's final episode of "Hannah Montana," Miley Cyrus will officially leave her alter ego behind. After four seasons, 98 episodes, a full-length movie and a 3-D concert film, Cyrus will be hanging up her blond wig for good.

As the show wraps up, it begs the question: What's next for the teen queen? Well, Cyrus, 18, seems to be putting recent tabloid troubles behind her and concentrating on her very busy movie career. She has several flicks in the works, including "LOL," in which she stars alongside Demi Moore and "Twilight" star Ashley Greene.

"Miley is a phenomenon — she's accomplished so much in the movie, TV and music worlds that it's not surprising how much attention was attracted during filming," co-star Greene said. "But we're both professional and understand that we're there to do our jobs. Work was our number-one priority, and everything else was background."

Miley's also currently filming the action-comedy flick "So Undercover," in which she plays an FBI agent.

"I've been actually doing all kinds of stuff. ... I've been doing fighting, like learning how to box ... mostly street fighting, so knowing how to, like, if someone comes up from behind you, being able to defend yourself," she said about her role. "I have a trainer and I have bruises everywhere from kicking the bags. ... And I've learned how to use guns, which was really scary."

Filming for "So Undercover" is well under way, and she's been hanging out with co-star Kelly Osbourne. In addition to "So Undercover," Miley's set to work on the thriller "Wake," and is rumored to be working on getting her supernatural romance "The Big Bang" adapted from a music video to the big screen.

Movies aren't the only thing Miley is working on these days. While she's made it clear she wants to take a break from music to focus on her bustling film career, it's rumored that a Miley-Nick Jonas reunion "double disc duet album" is in the works.

Music producer Shakur Green, who has worked with Miley in the past, tweeted that he's working on tracks with Miley and former beau, Nick Jonas. "Can't release any additional information about the project," he shared. "Other than it's going to be one of the top albums of 2011."