Britney Spears' Las Vegas residency kicked off last night, and the triple-threat star left nothing to chance in the glam, over-the-top performance!
The "Piece of Me" show at Caesar's Palace features insane sets and eight costume changes for the star, including an angel costume complete with enormous wings.
Plenty of Brit's celebrity friends showed up last night to support her on opening night, including Katy Perry, Adam Lambert, Miley Cyrus, and Holly Madison, who also stars in a Vegas show. Mario Lopez not only came with a big group of friends, he even got up to dirty dance on stage with Brit during a racy part of the show!
"They dressed him in a dominatrix harness and made him crawl around the stage," an audience member told Life & Style. "Britney and two male dancers took turns whipping Mario's rear end until he ended up at the front of the stage. At the end of the song, Britney thanked Mario for going onstage, and signed a T-shirt for him to take home."
Britney's family was also there to lend support, including sister Jamie Lynn Spears, her fiance Jamie Watson, daughter Maddie, and mom Lynne Spears. The Spears sisters sing a duet, "Chillin' with You," on Brit's new album.
And because this is Britney we're talking about, there was plenty of dancing! By the end of the show, most audience members were out of their seats dancing and enjoying the performance. Britney sang almost all of her big hits, including "Oops! I Did It Again," "Scream and Shout," and "(Hit Me) Baby One More Time," as well as her new songs like "Perfume" and "Work Bitch."