Singer Katy Perry has gone for a racy makeover for the cover page of the latest issue of Rolling Stone magazine,appearing almost nude. The 26-year-old singer,known for her often provocative onstage antics,is seen wearing just a blush two-piece lingerie set and a sultry look,while she dons only fishnet stockings for one sexy beach shot inside the magazine. Perry,who married comedian Russell Brand in India last year,said she had to work hard to get in shape for the saucy spread and her upcoming world tour,reported Contactmusic. "I'm on a meal plan,which absolutely sucks. But,on Sundays,I get to have a cheat day where I go buck wild and eat In-N-Out Burger. "I'll work out,go to a vocal lesson,run through the entire set at rehearsals,go to dance rehearsal until 10pm and then go home and sort through e-mails concerning the production. I feel like I'm training for the Olympics!" said Perry.