The 34-year-old pop icon hit the Billboard Music Awards red carpet on Sunday in a sheer black one-piece, complete with a lengthy train and no pants. Spears showed off her gorgeous gams in a pair of thigh-high, fishnet style boots.
Spears is set to receive the Millennium Award at Sunday's show, where she'll also open the ceremony with a medley of her biggest hits. The singer is only the third recipient of the show's prestigious honor, which was first given to Beyonce in 2011 and followed by Whitney Houston -- with daughter Bobbi Kristina Brown accepting the award -- one year later.
During the Billboard Music Awards, airing live from the T Mobile Arena in Las Vegas at 8 p.m. ET/5 p.m. PT on ABC, Spears will show off even more of her flawless physique in in a glittering red bodysuit designed by Mark Zunino. Only ET has the exclusive sketches and details from the designer himself! See them here.