After making a jaw-dropping appearance on the red carpet, Britney Spears opened the Billboard Music Awards on Sunday night with an epic mashup of her iconic songs. Britney slayed a handful of her biggest hits, from "I'm a Slave 4 U" and "Toxic" to fan favorites "I Love Rock 'n' Roll" and "Breathe on Me" - and don't even get us started on how insane her body looked in that red bejeweled number. Whether you missed Britney's performance or just want to relive her ***y time on stage, we've got the hot photos.