BOY ZONE: Katy Perry, having kissed a girl and liked it, is puckering up for the men’s shows. Word has it the singer, slated to perform in Milan this week, will turn up at Roberto Cavalli’s show today.

BLOGGER WINDOWS: Holt Renfrew is the latest fashion player to catch social media fever. The Canadian department store chain is preparing a series of blogger-inspired window displays for nine stores, including the Toronto and Vancouver flagships. Due to be unveiled Friday, the windows will salute high-profile names in the fashion blogosphere, notably The Sartorialist’s Scott Schuman, Bryanboy, Tommy Ton (Jak & Jil) and 17-year-old Texan Jane Aldridge (Sea of Shoes). Engineered by Holt Renfrew’s creative director John Gerhardt — and apparently with no direct input from the bloggers themselves — the windows will include captures from the blogs and possibly mannequins dressed as the bloggers. The windows won’t be the first retail hookups for Schuman and Ton. In 2006, Schuman inspired a similar visual merchandising project at Saks Fifth Avenue and he has shot advertising campaigns for DKNY Jeans and Australia’s SABA chain, while Ton recently shot a campaign for Hong Kong’s Lane Crawford. And retail isn’t the only industry courting fashion bloggers. Last Thursday, in a temporary art gallery in Munich, Absolut Vodka unveiled “Visions in an Absolut World,” an exhibition of 121 artworks created by 11 bloggers — including Bryanboy, The Cobrasnake, Facehunter and Les Mads.