The party doesn't stop when the Grammy Awards end!
Perry and Mayer made the Warner Brothers Music bash at the Chateau Marmont around midnight where they held hands and acted cute and coupley at their private table opposite Quincy Jones. The lovebirds also chatted with friends, including Glee guy Darren Criss.
Other couples at the Warner party included country cuties Blake Shelton and Miranda Lambert, Kelly Clarkson and her fiancé Brandon Blackstock, Nikki Reed and Paul McDonald and Girls' Lena Dunham and her fun. beau (and Grammy winner) Jack Antonoff.
Perry and Mayer's love train continued when they stopped by the Sony Music Grammy Reception at Bar Nineteen 12, where Adele snapped adorable pics with Clarkson and fellow Brit singer Cher Lloyd. "Don't worry about it ...I'm just hanging out with one of the best singers in the world," Clarkson tweeted about her pic with Adele. "What a cool chick as well!"
Over at the Island Def Jam Grammy party at Osteria Mozza, Rihanna laid low while hanging out in the VIP room with pal Nas. Ri-Ri was even spotted enjoying an expensive cigar while catching up with Nas at the Samsung Galaxy and Pepsi-sponsored soiree.
Rihanna also reunited with her Grammys' cuddle buddy Chris Brown at his Zing Vodka Grammys party at Supperclub last night. Both were spotted sipping on drinks while hanging out with the likes of Bruno Mars, Tyga and Real Housewives of Beverly Hills star Adrienne Maloof.
It was date night for Sean "Diddy" Combs and Cassie at Greystone Manor's Hennessy V.S. event. The couple were all over each other at their VIP table, making out and dancing into the early morning hours.
Gossip Girl hottie Chace Crawford enjoyed himself with pals alongside Best Album winners The Black Keys over at the Peligroso Tequila after party at Hollywood hot spot Jane's House.
Carly Rae Jepsen continued the night's festivities and fun by taking in a show with friends and family at Jazz Night in the Living Room at the W Hollywood.
Carrie Underwood opted to celebrated her win with a low-key dinner with friends at Sushi Roku Hollywood.