Britney Spears Goes Pantsless in Sheer Billboard Music Awards Red Carpet Look

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Slay, Britney Spears! Slay!

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.

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WATCH: Britney Spears to Receive Millennium Award and Perform Medley of Her Biggest Hits at 2016 Billboard Music Awards

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. 

EXCLUSIVE PICS: Designer Mark Zunino Reveals Inspiration Behind Britney's BBMAs Costumes

Meanwhile, with Spears still hard at work on her Las Vegas residency, the singer recently offered an update on what fans can expect from her next album!

WATCH: Britney Spears Teases ‘Very Different’ New Album: ‘It’s the Best Thing I’ve Done in a Long Time’