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Leona Lewis shows off her sexy side on the cover of InStyle UK’s June 2010 issue!

Here’s what the 25-year-old British singer (wearing Preen at Selfridges) had to share:

On her relationship with Simon Cowell: “I’m very fiery and very passionate. We don’t argue, we debate.”

On her favorite fashion designers: “I still love my big ballgowns with a kind of twist to them, but I also like Vivienne Westwood because she’s kind of punky and does really nice shapes for ladies. I like Antonio Berardi because I like his shapes too. And William Tempest. And I like Stella McCartney because she’s got a vegetarian range. I want to do a vegetarian range of clothing. I haven’t had time to properly focus on it, but I’m still designing.”

On maintaining modesty in projects: “No weird sex books for me. I would never even do a bikini shoot. It’s too embarrassing.”