Britney Spears concluded the American leg of her wildly-successful Circus tour at Mandalay Bay in Las Vegas, Nevada on Sunday by giving former 'N Sync heartthrob Lance Bass a tawdry lap dance on stage.

During her rendition of Breathe on Me, Britney called the 30-year-old Bass out of the audience and gave the fresh-faced DWTS alum a sexy bump-n-grind.

Britney Spears Takes a Smoke Break - or two!

• TAGS

• Breathe On Me
• Britney Spears
• Circus
• Circus tour
• Lance Bass
• Las Vegas
• Mandalay Bay