Still On?! Katy Perry and John Mayer Spotted at Grateful Dead Concert -- See the Pics!

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Photo: Getty Images
She just can't quit him.
It appears Katy Perry and John Mayer are on again ...again. The "Who You Love" singers were spotted over Fourth of July weekend at the second show of the Grateful Dead's three-night Fare Thee Well concert series in Chicago.
Perry, 30, dressed the part, wearing a tie-dye tank-top and ripped jeans. Mayer, 37, wore a blue bandanna in his hair, a denim shirt and loaded up on the accessories.
The "Firework" singer Instagrammed a pic from the concert, simply writing: "grateful."

The on-again, off-again couple also seemed more than willing to snap a few pics with fans, and they weren't the only famous faces at the July 4th show.
Photo: Twitter
Photo: Twitter
Woody Harrelson, Chloe Sevigny, Game of Thrones author George R.R. Martin and Jenny Lewis were all in attendance.
However, Mayer might be the biggest Deadhead of them all. Billboard reports that the singer/songwriter has attended a total of five Grateful Dead concerts during their Fare Thee Well tour. Do you think these two are right for each other?Perry and Mayer's recent sighting doesn't come as too much of a surprise as they were also spotted together this past May at a Met Gala after party in New York City. See what went down that night in the video, below.