Cher Vanity Fair December 2010 cover black leotard fishnets

Cher sparkles on the December cover of Vanity Fair. Photo: Norman Jean Roy, exclusively for Vanity Fair

With her flawless face and still-bangin' body, Cher seems to have turned back time on the December cover of Vanity Fair.

But the 64-year-old "Burlesque" star, who shows off her super-trim torso in a black leotard and accentuates her mile-long legs with fishnet stockings and a pair of strappy heels, says she doesn't rely on time travel to keep in top form.

"I've been screaming at the top of my lungs at my family, 'Work out! Work out! Old age is coming!'" the former star of the CherFitness video series tells the magazine.

"At some point you will need the strength. Who would have ever thought you would get this old?"

Or still look so amazing.

Inside Vanity Fair, the singing legend dazzles in glamorous photos by shutterbug Norman Jean Roy. In one shot, Cher channels her '70s Bob Mackie heyday in a blue-green embellished gown with matching gloves and headdress.

In another, she transforms into a redheaded vaudeville showgirl, bathed in stage lights while wearing a glittery maroon gown and feathery capelet.

Obviously, the woman who launched a thousand drag queens enjoys being a girl -- a fact she makes clear when discussing daughter Chaz Bono's recent gender-reassignment surgery.

"If I woke up tomorrow in a guy's body, I would just kick and scream and cry and f---ing rob a bank, because I cannot see myself as anything but who I am -- a girl," she explains. "I would not take it as well as Chaz has. I couldn't imagine it."

In fact, the superstar admits she still gets confused when referring to Chaz's gender. "She's a very smart girl -- boy!" Cher says, correcting herself. "This is where I get into trouble. My pronouns are f--ed. I still don't remember to call her 'him.'"

With the performer's film "Burlesque" arriving in theaters Nov. 24, the Oscar winner is looking forward to taking on more acting roles, even if it means taking down pal Meryl Streep in the process.

"I think Meryl [Streep] is doing it great," she says of acting while aging in Hollywood. "The stupid bitch is doing it better than all of us! But I don't like it. It's getting in my way. I have a job to do, and it's making my job harder."

In related news, check out Bob Mackie's take on Cher's fashion legacy at Vanity Fair's web site.

Also, check out "Burlesque" co-star Christina Aguilera's style evolution.