Katy Perry not only changed outfits to show some leg in a furry coat, she also switched up her hair. The 30-year-old "Roar" singer looked almost unrecognizable in her new blonde, '80s style 'do -- a departure from the dark pixie cut she wore on the red carpet -- but it's her company that had everyone talking. According to Us Weekly, she and her on-again, off-again ex John Mayer are definitely on again, and were spotted "leaning in for many passionate kisses" and holding hands throughout the night.
The magazine also reports that Katy was able to get in some friend time with her longtime pal Robert Pattinson, and quickly bonded with his reported fiancee FKA Twigs. Mayer and Pattinson also socialized, stepping out together for a smoke.
As for Katy's bestie Rihanna, after a showstopping red carpet appearance, she changed into a more casual outfit for her own afterparty at Up & Down -- most noticeably, ditching the bra.
Famous attendees at Rihanna's party included Kylie and Kendall Jenner, with Kylie going very casual given the occasion in denim cutoff shorts and a Moschino sports bra. Kylie's reported boyfriend, rapper Tyga, was not far behind, going similarly casual in an orange t-shirt and jeans.
Surprisingly, E! News reports that Selena Gomez and Justin Bieber were in the same room together for a lot of the night at Rihanna's party, but only "exchanged some words." Justin reportedly stuck next to Kendall and friends, while Selena -- who changed into a short black minidress -- stuck close to her gal pals, including her Spring Breakers co-star Vanessa Hudgens. According to Us Weekly, the two did tequila shots and danced up a storm throughout the night.