In the words of Lizzo, "Welcome to the Grammys bitch!" Or, better yet, Grammys after parties, bitch.

Indeed, following Sunday night's 2020 Grammys ceremony, there was plenty to celebrate. Billie Eilish made history as the youngest artist to win Album of the Year and the only female to ever win big in all four major categories. Plus, Demi Lovato made her triumphant return to the stageAriana Grande took off her "engagement" ring and Camila Cabello brought the Staples Center to tears with her tribute to her dad. And, throughout the  event, music's biggest stars used their art to honor Kobe Bryant, who tragically passed away in a helicopter crash just hours before the red carpet.

"We're gonna all join together and do what we do in happy times and in challenging times," host Alicia Keys said. "We're gonna sing together, we're gonna laugh together, we're gonna dance together, we're gonna cry together, we're gonna bring it all together. We're gonna love together, and we're gonna make sure that we are celebrating the most powerful energy, the most beautiful thing in the world, the one thing that has the power to bring all of us together, and that's music."

And that didn't stop once the show ended. Rather, the festivities continued at the star-studded after parties.

At Universal Music Group's festivities, held at Rolling Greens in Downtown L.A., Billie Eilish was all smiles as she walked in with her brother Finneas O'Connell, his girlfriend Claudia Sulewski and their parents. Escorted straight back into a private booth, the superstar posed for pictures before relaxing on the couch. "She was really happy," an eyewitness tells E! News. "She was happy to talk to every well-wisher who approached." Of course, Finneas and Claudia couldn't help but celebrate the big night a sweet kiss.

Later, on the back patio, Billie fangirled over Ezra Miller, telling him how she was "obsessed" with him. "It was so cute," adds the witniss. "He told her he was obsessed with her and then pulled her in close for a hug."

Meanwhile. Lewis Capaldi hung out with Hailee Steinfeld, who was in an upbeat mood as she chatted with girlfriends. YG and Kehlani walked in hand-in-hand after sparking split rumors while "social butterfly" YungBlud moseyed about with a can of beer in his hand.

Over at Steven Tyler's party to benefit Janie's Fund, host Terry Crews opened with a tribute to Kobe. Around 8 p.m. local time, the power goes out during the viewing party—and Terry announced via megaphone that Billie had scored two more awards. In the dark, waiters served dessert while staff handed out glow sticks. Later, Stassi Schroeder's recorded her Beau Clark getting his mind read by mentalist Lior SuchardGavin DeGraw performed and the Aerosmith frontman himself played a harmonic, which he auctioned off. A piece of the wall Run DMC broke goes for $20,000.

Terry Crews, 2020 Grammys, Party Pics

Anna Webber/Getty Images for Janie's Fund

Elsewhere, at the Republic Records bash, guests including Pia Mia, Madison Beer, Nikita Dragun, Stassie Karanikolaou, Chantel JeffriesMadelaine Petsch sipped on Fiji Water, Ciroc and Don Julio.

For their part, the newly-reunited Jessie J and Channing Tatum turned the evening into a PDA-filled date night. Entering the party dancing, Channing "looked super happy," explains an insider. And once they arrived at their table, he was "all over" Jessie, according to the partygoer: "They held each other for a moment while chatting. It was super nice. They were letting loose." Throughout the night, they were seen whispering in each other's ears or sharing a sweet kiss. Later, the were joined by Dennis Quaid and his fiancée Laura Savoie. "Dennis and Channing were dancing together," says the insider. "Dennis then took a selfie with Jessie and Channing. It was so cute and looked like a family portrait."

Meanwhile, Noah Cyrus and Machine Gun Kelly walked hand-in-hand after posing for pictures together. While they stayed close all night, Diplo danced around in his cowboy hat. Adds the insider, "He looked like he was living his best life!"

Scroll ahead to see every must-see picture from the night!

Camila Cabello, Shawn Mendes, Grammys Afterparty

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Finneas OConnell, Claudia Sulewski, Billie Eilish, 2020 Grammys, Party Pics

Chelsea Lauren/Variety/Shutterstock

Dennis Quaid, Channing Tatum, 2020 Grammys, Party Pics

Kevin Mazur/Getty Images for Republic Records

Hailee Steinfeld, 2020 Grammys, Party Pics

Stefanie Keenan/Getty Images for FIJI Water

Chrissy Teigen, Cyndi Lauper, John Legend, 2020 Grammys, Party Pics

John Sciulli/Getty Images for Sony

Diplo, Orville Peck, 2020 Grammys, Party Pics

Charley Gallay/Getty Images for Sony

YG, Kehlani, 2020 Grammys, Party Pics

Chelsea Lauren/Variety/Shutterstock

Billie Eilish, Claudia Sulewski, 2020 Grammys, Party Pics

Lester Cohen/Getty Images for Universal Music Group

Steven Tyler, Gavin DeGraw, 2020 Grammys, Party Pics

Anna Webber/Getty Images for Janie's Fund

Noah Cyrus, Conan Gray, Machine Gun Kelly, 2020 Grammys, Party Pics

Kevin Mazur/Getty Images for Republic Records

Tom Kaulitz, Heidi Klum, 2020 Grammys, Party Pics

Jordan Strauss/Invision/AP/Shutterstock

Usher, John Legend, 2020 Grammys, Party Pics

John Sciulli/Getty Images for Sony

DJ Khaled, Koffee, 2020 Grammys, Party Pics

Jesse Grant/Getty Images for Sony

Rob Stringer, Lil Nas X, Ron Perry , 2020 Grammys, Party Pics

John Sciulli/Getty Images for Sony

Destiny Rogers, H.E.R., 2020 Grammys, Party Pics

Jesse Grant/Getty Images for Sony

Chantel Jeffries, Diplo, 2020 Grammys, Party Pics

Stefanie Keenan/Getty Images for FIJI Water

Madison Reed, Victoria Justice, 2020 Grammys, Party Pics

Christopher Polk/Rolling Stone/Shutterstock

Usher, FKA Twigs, Matt Shultz, 2020 Grammys, Party Pics

Charley Gallay/Getty Images for Sony

Nathalie Emmanuel, Sydney Sweeney, Camila Coelho, 2020 Grammys, Party Pics

Anna Webber/Getty Images for Janie's Fund

Lincoln

Shane Karns/Guest of a Guest

With reporting by Alli Rosenbloom, Amanda Williams and Carly Shihadeh

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