John Travolta and Lady Gaga were among the stars to catch that Sunday night fever when the 59th GRAMMY Awards wrapped up and the after parties began.
After performing with Metallica at the awards show, Gaga was ready to let loose and hit the dance floor with the Saturday Night Fever star himself! Donning a little leather getup, the 30-year-old singer busted a few moves with Travolta at Interscope's GRAMMY after party, held at h.wood Group's Peppermint Club in Los Angeles, California.
But they weren't the only stars out and about in Hollywood on music's biggest night. ET has your inside look into the hottest GRAMMYs after parties:
Sony Music Entertainment 2017 Post-Grammy Reception
After her big, emotional win at the GRAMMYs, Adele changed into yet another show-stopping ensemble and hung out with her Sony Music friends at Hotel Bel-Air. The 28-year-old singer chose a printed shimmery black and gold pantsuit along with a sexy sheer top.
Ciara's baby bump was on full display when she showed up with husband Russell Wilson at Milk Studios for Warner Music Group's GRAMMY bash. The singer appeared to be wearing a blue and white bathrobe over an all black outfit, while the NFL pro also rocked a simple black ensemble.
Also at the party was Twenty One Pilots musician Tyler Joseph, who spoke to ET about stripping down to his underwear when he accepted his GRAMMY for Best Pop Duo/Group Performance. "My wife [Jenna Black] is a fan of my legs so I had to give her a present today," Joseph quipped. "I'm still wearing the same ones [underwear.] I didn't plan at all. I just kind of grabbed it. It was dark. It was in the morning. I just grabbed whatever I had. I'm glad I was wearing underwear honestly."
A slew of stars showed up to this party at the Ace Hotel, including Katy Perry, Beck, Cassidy Pope, Niall Horan, Keith Urban, Ellen Page, Katharine McPhee, Chord Overstreet, Don Cheadle and Russell Simmons.
A number of celebrities switched into different styles upon hitting up the after parties, but not before ET caught up with them. Here's a look at some best, worst and weirdest moments from the GRAMMYs red carpet: