Britney promoting new album with free show in Las Vegas

Fans and curiosity seekers have already started applying for free tickets to see Britney Spears sing for a MTV special Friday at the Palms nightclub Rain.

News of the show surprised entertainment sites Monday. Tickets are being handled for MTV through — listed as “6:00 PM—MTV Special.”

“DO YOU WANT TO ATTEND MTV's BRITNEY SPEARS SPECIAL in LAS VEGAS?” the site asks. “We are casting HUGE fans of Britney Spears to be a part of an MTV Special in Las Vegas.”

As a casting call, tickets are not first-come first-serve. Fans are being selected individually.

Britney is using the show to kick off next Tuesday’s release of her first album in two years, “Femme Fatale.”

But that seventh studio album is streaming online already.

She’s now 29 and a few years beyond a meltdown of ambulances and hospitals.

TMZ on Tuesday reported she’s making tour dancers and other workers sign non-disclosure agreements to protect Britney from the presence of booze and drugs, and to submit to random drug testing.

Britney’s history in Vegas is hectic, to say the least.

In 2007, her comeback performance at the MTV Video Music Awards at the Palms showed her seeming out of control and unprepared, stumbling vocally and physically on stage.

But she’s good friends with Palms owner George Maloof. So she’s partied at Palms clubs, suites and private parties on and off for years — with a who’s who gamut from Paris Hilton to Diddy.

It was at the Palms’ ghostbar where she and Jason Alexander (no relation to the actor) decided to get married in January 2004. They annulled 55 hours later.

Her 2001 HBO special, shot in the heat of her stardom, was at the MGM Grand: “Britney Spears Live from Las Vegas.”

She was even linked to Luxor headliner Criss Angel after her divorce from Kevin Federline.

And so, here is comeback number-who-knows.