Britney Spears Performs on 'Jimmy Kimmel Live!' (Video)

She sings "Till the World Ends” to promote her new album, Femme Fatale.

Britney Spears performed "Till the World Ends" on Jimmy Kimmel Live! Tuesday night.

The singer released her seventh studio album Femme Fatale Tuesday, and announced a tour with Enrique Iglesias, who dropped out several hours later. (But sources say he's negotiating to rejoin.)

Earlier that day, Good Morning America aired a live concert she taped in San Francisco over the weekend.

Spears has received mostly positive reviews for her new album and performances.

Also on Jimmy Kimmel Live: Spears appeared in a Jackass 3D clip that Johnny Knoxville quipped was cut from the film, and she jokingly got tattoos with Kimmel.