Katy Perry Pictures in Green Gucci Dress at 2013 Grammys

Katy Perry posed for photos in a sexy green Gucci gown as she arrived at the Grammy Awards in LA today. Katy didn't bring along boyfriend John Mayer to the show, instead choosing pal Allison Williams as her date. Last week, Allison chatted about her friend Katy saying, "She's the hottest date. She's a friend of mine and she's nominated as she should be." Katy will have plenty of support if she takes home the win for best pop solo performance for "Wide Awake." Even if she's not the winner, Katy will take the stage as a presenter during the show.