Apparently Katy Perry didn't get the Grammys wardrobe memo. Perry is yet another star who pushed the limits of the wardrobe mandate at the 55th Annual Grammy Awards, with a tight mint green, cleavage-baring gown that blatantly violated the memo CBS sent out to Grammy attendees. The mandate emailed earlier this week by CBS' standards and practices department demanded stars "please be sure that buttocks and female breasts are adequately covered," and Perry certainly disregarded that request Sunday night.

Katy Perry at the Grammys (Photo: Kevin Mazur/WireImage)Even E!'s Ryan Seacrest seemed noticeably flustered while interviewing Perry on the red carpet -- aside from being extremely tight, the dress exposed a large amount of cleavage. When he asked Perry about her look, Perry discussed her inspiration.

"I was inspired by Priscilla Presley in the '70s," the pop star explained. Without addressing her scandalous dress, she chose instead to focus on her flowing hairstyle. "The big hair, closer to God," she said.

Katy Perry and John Mayer get cozy at the Grammys. (Kevin Mazur/WireImage)

Seacrest's co-host Giuliana Rancic later asked how he kept focused during the interview. Seacrest had a quick response: "When you are my height you have a lot of experience staying focused at that eye line. Lots of practice."

On Saturday night Perry did a much better job adhering to those guidelines at the Grammys MusiCare Person Of the Year Gala, which honored Bruce Springsteen. The singer wore an orange Alexander McQueen gown for the ceremony, and received rave reviews for her fashion choice.

Perry is a nominee and presenter at the 55th annual Grammy Awards Sunday night. Earlier this week it was reported that Perry would not be taking beau John Mayer to the ceremony, but instead would be attending with friend and "Girls" actress Allison Williams.