Katy Perry’s latest ‘California Dreams’ tour in the US – kicking off on June 7 – will include a costume-change magic trick.

The ‘I Kissed a Girl’ singer said that she saw the trick performed on an episode of ‘America’s Got Talent’ and decided she wanted it for her show. She managed to convince the performers to teach her the trick, but had to promise not to tell anyone else.

During an Entertainment Weekly interview alongside support act Robyn, Perry explained: "I saw these two magicians do it on America's Got Talent... and I thought, 'I'll have them teach me the trick.'

"I had to sign a nondisclosure agreement saying that I wouldn't give away the secrets behind the magic trick."

Check out some behind-the-scenes footage of Perry’s ‘California Dreams’ tour below: