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John Mayer, Def Leppard

Courtesy: Knight Bilham Photography

John Mayer may be recently single, after splitting from Katy Perry, but he doesn't seem to be down in the dumps about it.

In fact, the 35-year-old was spotted rocking out to Def Leppard's resident show VIVA Hysteria! at The Joint at Hard Rock Hotel & Casino in Las Vegas, where the English rock band is currently headlining for an exclusive residency.

The band performed their iconic album Hysteria in full along with a selection of their greatest hits. John is clearly a huge fan as he hung out with band backstage and posed for pictures.

Here's hoping we get a cover version of "Pour Some Sugar on Me" on Mayer's next CD.