Why Did Katy Perry Slap Russell Brand?

05/27/2010 AT 04:50 PM EDT

Don't mess with Katy Perry's pussycats – or you'll get smacked in the head.

To promote his one-day pop-up shop, Buy Love Here – where, instead of paying cash, customers can barter with their unwanted goods – Perry's finacé, Russell Brand, released a YouTube clip showcasing all the things he didn't want anymore. Among the items: a Hitler pincushion, a pair of slippers – and the couple's new kitten, Krusty.

The latter earned Brand a slap in the head.

Brand's pop-up shop will take place Thursday between 2 p.m. and 6 p.m. at the Beverly Center in Los Angeles.

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