Keith Urban and Nicole Kidman love a night at the opera, but not when they’re attacked with programs by avid opera fans.

The pair found themselves in a heated exchange against an opera lover at the Sydney Opera House, where the man allegedly hit Kidman with her program.

Of course, this was all just rumours until Urban confessed the story was true on The Kyle and Jackie O show.

“We were sitting down with Nic’s mum and we were clapping. It was a bloody great performance and everyone was cheering and cheering,” Keith said.

“I looked around and I see a few people standing and a few more and I thought ‘oh I’m getting up’.

“And then this guy behind me just whacked Nic, like really hit her, with the program.”

“It’s a bit of a pickle I was in because I’m a husband and you want to defend your wife but it took a lot of restraint. I was pretty upset,” he said.

Keith explained that it was his first time at the opera and was unaware standing up was a bad thing.”We did not know you are not supposed to stand in the opera. Having not been to the opera before ever in my life, I am sensitive to the etiquette,” he said.

It’s unclear whether the pair have plans to return to the opera after the exchange.