No one puts Katy Perry in a dress code.

Not even the fashion police at CBS.

The pop singer chose a mint green Gucci gown to wear to the Grammys with her gal pal Allison Williams. But when she ran into another power couple, Ellen Degeneres found her fashion choice a bit revealing. "Here I am taking a tasteful glance at Katy Perry's dress," the talk show host tweeted, while sending a picture of herself and her wife Portia de Rossi.

Katy Perry says she was inspired by Priscilla Presley during the Elvis years.