The MTV Video Music Awards host was spotted pashig Katy Perry at Lady Gaga's after-party at Avenue, after joking onstage that he had the hots for her!

Rusty was sprung admiring Katy's girls before kissing her. An onlooker at the Meatpacking District hot spot told Page Six, "They were sitting very close together, flirting and whispering to each other with their faces very close. Then Russell leaned in for a long kiss. It didn't look like this was the first time. He was looking extremely pleased with himself." 

It's come to my attention that Rusty is very dribbly - so ewwwww!  Oh, and Ms Katy was also spotted canoodling with John Mayer a few days earlier!