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Katy Perry and John Mayer made their own fireworks this weekend

A celebrity gossip junky, Caroline Goddard has been writing entertainment news for longer than the world has known Kim Kardashian's name. Follow her on Twitter at @GoddardCaroline.

Why are Katy Perry and John Mayer hanging out? This likely won't end well

Katy Perry and John Mayer appear to be on again — and they went semi-public with the news someplace we would never expect to see them.

The former couple seems to have reunited again and was spotted shaking their bones at the Grateful Dead's 50th anniversary farewell concert series in Chicago over the weekend.

"They were backstage being super sweet together — but not standing too close — in a big group of friends," a witness told People. "Someone handed her a tie-dyed rose. Katy was extremely polite, gracious and friendly."

But if that sounds super innocuous to you, never fear — because someone actually got a pic of the pair in what could only be described as an amorous moment. At least for Katy, anyway.

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Perry hasn't commented on the recoupling, but she did post a pic of those tie-dyed roses on her Instagram.

Tell us: Are Katy Perry and John Mayer the best or worse relationship recyclers ever?

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