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After getting a look at Katy Perry's flawless figure, we're green with envy!

Katy posed for photos on the red carpet at the 2013 Grammy Awards on Sunday at the Staples Center, and she turned heads in a sexy green Gucci dress. Beau John Mayer was at the show, but interestingly enough, Katy brought Girls hottie Allison Williams as her plus one!

“She’s the hottest date,” Allison gushed to Anderson Cooper the other day. “She’s a friend of mine and she’s nominated, as she should be. I can’t wait to go. Obviously she’s awesome. She’s the best.”

Katy was nominated for Best Pop Solo Performance for “Wide Awake," but she lost out to Adele.