Headlights: Lady Gaga flashed the new trendiest kind of cleavage – underboob – on Sunday’s Grammy Awards red carpet

Rock ‘n’ roll! The 30-year-old pop diva paired her revealing black crop-top with matching thigh-high PVC boots selected by stylist Brandon Maxwell

The Super Bowl LI halftime headliner rocked rose gold highlights in her hair, classic Ray-Ban aviators, and tiny chained latex shorts

Gaga (born Stefani Germanotta) then joined Metallica on the red carpet outside LA’s Staples Center.

The six-time Grammy winner – who has a track called Heavy Metal Lover – put up her ‘paws’ with lead guitarist Kirk Hammett.

However, it’s unclear precisely what the A Million Reasons singer will be belting with the four LA rockers in their fifties.

Going Gaga: The singer put her body on displayFake? Gaga showcased an impossibly large ‘tattoo’ of a death’s-head hawkmoth that she claimed she’d gotten SundayReady to rock: Metallica do, in fact, have a track called Moth Into Flame which was on their Hardwired… to Self-Destruct album last year

‘Party with my friends’: Gaga (born Stefani Germanotta) then joined Metallica on the red carpet outside LA’s Staples Center

Mother Monster: The six-time Grammy winner – who has a track called Heavy Metal Lover – put up her ‘paws’ with lead guitarist Kirk Hammett

The only clue came in the form of an impossibly large ‘tattoo’ of a death’s-head hawkmoth Gaga claimed she’d gotten Sunday.

Metallica do, in fact, have a track called Moth Into Flame which was on their Hardwired… to Self-Destruct album last year.

Hammett and his bandmates Robert Trujillo, James Hetfield, and Lars Ulrich are also up for the best rock song trophy for their banger Hardwired.

What a chick: The singer uses her body to make a point

Mysterious collaboration: However, it’s unclear precisely what the A Million Reasons singer will be belting with the four LA rockers in their fifties

Eight-time Grammy winners: Hammett and his bandmates Robert Trujillo, James Hetfield, and Lars Ulrich are also up for the best rock song trophy for their banger Hardwired

Metallica tweeted: ‘It’s almost time to start warming up for the #Grammys gig! #Frantic tick tick tick tock!’

What, this old thing? Everyone wanted a picture with Gaga

Side view: It really was a memorable outfit

Owning it: The singer made quite the entrance

Metallica tweeted: ‘It’s almost time to start warming up for the #Grammys gig! #Frantic tick tick tick tock!’

Lady Gaga also had a close red carpet encounter with her friendly rival Celine Dion, who looked glamorous in a plunging emerald Zuhair Murad gown.

Perhaps there will be a future collaboration between the A-Yo songstress and the 48-year-old French-Canadian crooner.

Hey girl! Lady Gaga also had a close red carpet encounter with her friendly rival Celine Dion, who looked glamorous in a plunging emerald Zuhair Murad gown

Aries duo: Perhaps there will be a future collaboration between the A-Yo songstress and the 48-year-old French-Canadian crooner

Heavy metal icons: Later Gaga took to the stage to rock out with Metallica

Rock chic: The singer wore fishnets, PVC boots and hotpants as well as a Metallica t-shirt

Despite a technical glitch where James Hetfield’s mic didn’t work, the musicians put on quite a show