MTV.com News — Singer presented award to best friend of leukemia patient Jasmina Anema, who needs bone marrow transplant.By Jocelyn Vena Rihanna at the DKMS gala on Thursday Photo: Jemal Countess/WireImage Rihanna has been seen all around New York this w... more info

Perez Hilton — Poo! We were really looking forward to this. Due to the current Jesusita Fire that continues to burn in the Santa Barbara area, the Katy Perry concert at the Santa Barbara Bowl this Saturday has been postponed. The show has been rescheduled until Sun... more info

MTV.com News — 'She's happy. She's smiling,' Perry says of her friend.By Jocelyn Vena Katy Perry Photo: Theo Wargo/Getty Images Katy Perry and her new BFF Rihanna have been seen painting the town red in New York and even vacationing together in Barbados ... more info

VH1 News — Katy Perry said she "wouldn't mind" collaborating with her friend Rihanna, with whom she's been seen partying in New York this week. more info

Altsounds — With three worldwide smash hits already and global album sales exceeding 3 million copies, the excitement of Capitol Records' breakthrough artist *KATY PERRY's* album *ONE OF THE BOYS* continues undiminished, even as the first anniversary of its rele... more info

Undercover, Australia — Katy Perry has revealed that she was once a married woman. Perry got married in Las Vegas. more info

PopSugar — Rihanna sported a pantsuit for dinner and a bash at Derek Lam's new store before meeting up with Katy Perry in NYC last night. She was still in animal print this morning, as she stepped out to continue her form of sightseeing. Chris Brown's lawyers a... more info

ContactMusic — KATY PERRY, CYNDI LAUPER, YOKO ONO and hip-hop group N.E.R.D. have joined forces to front clothing store H&M's new Fashion Against AIDS collection.The artists have all... more info

Perez Hilton — Svedka hosted a release party in NYC on Wednesday night for Katy Perry's killer new single, Waking Up In Vegas. There were many special guests in attendance, like the one above. And even Rihanna showed up! Thankfully, there was no naughty Lady Sover... more info

VH1 News — Rihanna hit the town in New York again on Wednesday night, after going out with Katy Perry on Tuesday and attending the Met gala on Monday. more info