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Niall Horan apparently made a surprising discovery when he arrived at Met Life Stadium in New Jersey for Monday's One Direction concert.

He found Miley Cyrus' pants.

The singer tweeted an hysterical photo of himself wearing leggings covered with Cyrus' portrait.

"@MileyCyrus you left these in New Jersey!" tweeted Horan. "They are comfortable, not gona lie #twerk #tongueout."

Cyrus replied with her signature approval, “@NiallOfficial f*****k yasssss.”

The starlet didn't have any recent shows at the venue, so whether Horan really found the pants there is up for debate.

Regardless, it's pretty funny.

Check out the hilarious pic below!

Photo: Getty Images