Taylor Swift Meets Up With Calvin Harris, Gives Him a Big Kiss on the Cheek: Inside the Grammys 2016 After-Parties

The 2016 Grammys belonged to Taylor Swift .

The pop star was nominated in seven categories and won three awards: Album of the Year (1989), Best Pop Vocal Album (1989) and Best Music Video ("Bad Blood" feat. Kendrick Lamar). Taylor marked the occasion by hitting up a number of after-parties with her date for the night, Selena Gomez. Joined by Taylor's brother and parents, they first hit up Universal Music Group's 2016 Grammys after-party, held inside The Theater at Ace Hotel. "Everyone lost their minds when they walked in and swarmed the area," a source tells E! News exclusively, noting that Taylor spent some time talking to industry executives while her mom and Selena "hung back and danced." All night, the source adds, "Taylor looked happy and flawless."

Other famous attendees included Ariana Grande, Zendaya, Hailee Steinfeld, Joe Jonas, Anna Kendrick, James Bay, Brooklyn Beckham, Shawn Mendes, Russell Simmons, Alice Cooper, Joe Perry, Lisa Vanderpump, Camila Cabello, Kristin Chenoweth and Kacey Musgraves. The Weeknd and Bella Hadid arrived together, hand in hand. While the "Can't Feel My Face" singer mingled with industry people, Bella talked to Lisa Vanderpump, who co-stars with her mom, Yolanda Foster, on Bravo's The Real Housewives of Beverly Hills. "They were all smiles and hugged as they had an animated conversation," the source says. On the flip side, Bella had "no interaction" with DNCE's Joe Jonas, who used to date her sister, Gigi Hadid.

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Meanwhile, at the Warner Music Group Party, Missy Elliott took the stage and gave a shout-out to Pharrell Williams. Before performing their hit single "WTF," the rapper also paid tribute to a number of artists who have since passed, includingAaliyah, Biggie Smalls, Tupac, Big Pun, Whitney Houston and Left Eye.

Where did the rest of Hollywood party?

Nick Lachey and Vanessa Lachey left their kids at home to attend Playboy's Grammys after-party. The couple packed on the PDA in a private booth and were seen "laughing, kissing and smiling" throughout the night, according to an onlooker. Tyrese also hosted a private party at his house in Woodland Hills, where he hung out with celebrity guests including Snoop Dogg, Tyrese and DJ Ruckus.

Later that evening, Taylor met up with her boyfriend, Calvin Harris, at Hyde in L.A. "He was so excited for her," a source says of the DJ, who skipped the show to work on new music. "Taylor was so happy to be around Calvin." He later Snapchatted a picture of Taylor giving him a kiss on the cheek. DJ Dillon Francis also shared a picture with Calvin and Taylor on Instagram, writing, "I love my friends."

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According to an eyewitness, Taylor arrived at HYDE with Calvin, Lorde and Ellie Goulding in tow. "She was super social, saying 'hi' to everyone throughout the party. They hung out in the main dance floor area for a bit at a table before making their way to the VIP section in the back. Calvin was overheard talking about how proud of Taylor he was." Taylor and her boyfriend shared "a kiss here and there," the eyewitness tells E! News exclusively. "The way they looked at each other said it all."

In addition to Taylor and her crew, HYDE was packed with tons of A-list celebrities. Ariana arrived just before The Big Bang Theory's Kaley Cuoco and went straight to the VIP section, while Joe entered the club around 11:30 p.m. and headed to his reserved area. The "Cake by the Ocean singer" was later seen standing on a table, where he proceeded to dance and take "a lot of photos with fans." Cody Simpsonwas seated at a table opposite Joe—interesting placement, given that the two singers share a mutual ex in Gigi. The Australian pop star "was seen dancing with a group of blonde girls." Meanwhile, The Weeknd and Bella arrived around midnight and went straight to the VIP section. The two "were only talking to themselves," a source tells E! News, adding that they "were in their own world."

Taylor and her crew bounced around 2 a.m.

"They were some of the last people to leave the party," an eyewitness says.