Katy Perry Posts Revenge Instagram After Breakup With John Mayer

Not only did Katy Perry give us another peek at her slime green hair, but that bod! Can you say breakup diet?

Katy posted the above snapshot on Instagram the other day and wrote, "Just like a casual Tuesday lewk?" Obviously the pic was taken from a photo shoot, so we can't wait to see the finished product.

Katy and John Mayer broke up about six weeks ago, and though the two aren't currently speaking, a source tells E! News the 29-year-old singer is "doing really good" and she "is in great spirits right now." What does have her full attention is her upcoming Prismatic tour, which kicks off on May 8 in Belfast, Northern Ireland.

"Katy is focused on her tour right now," the source added. "She is not allowing anything to distract her from it." Sounds like a good plan!