Britney Spears Dances on the Lap of Lance Bass

Britney Spears wrapped up the U.S. leg of her Circus Tour last night in true Britney fashion.

No, she didn't shave her head, endanger any children or have an unfortunate wardrobe malfunction.

Instead, Spears invited a male audience member on stage and seduced him with a lap dance; this time, though, we doubt it took: the special guest, as seen below, was Lance Bass!

Bass got an eyeful during the singer's rendition of "Breathe on Me." Fans in attendance say he smiled and sang along throughout the song. Wrote Britney on her official website:

My good friend Lance surprised me on stage last night for Breathe On Me. It was soooo funny!  Good to see you Lance!

The night before, Miley Cyrus and Melanie Brown caught Britney's concert. Neither of them appeared on stage, though.

Next, the pop star likely heads to Starbucks tonight at 2 a.m. Then, she heads Down Under for a string of dates in Australia in November.