Britney Spears kicked the Billboard Music Awards into high gear on Sunday, opening the show with a medley of her greatest hits as she accepted the prestigious Millennium Award.
Starting her set in a ruby red jacket, top hat, and thigh-high boots designed by Mark Zunino, Spears delivered "Work B*tch" amid a sea of sexy backup dancers. As she transitioned to "Womanizer," the incredibly fit mother of two stripped down to a dazzling lingerie-style ensemble, showing off her flawless physique.
The heavily-choreographed routine also pyrotechnics and a giant mechanical electric guitar, which Spears hopped on and rode like a bull during "I Love Rock ‘N’ Roll."
The pop icon also delivered sexy renditions of "Breathe on Me" and "Touch of My Hand," even taking a spin on a stripper pole during "Slave 4 U."
Adding a feathery red bolero to her ensemble, Spears closed her set on a high note with "Toxic." Moments later, ET spotted the singer backstage shedding a few sweet tears of joy over her stellar performance.