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When Vienna Girardi told Star magazine that she was going to be on the cover of Playboy, it came as a shock -- especially to the folks at Playboy.

"This is the first we've heard of Vienna Girardi appearing on the cover of Playboy," a rep for the men's mag tells

Girardi, 24, told Star she hoped to make $250,000 from her sexy pictorial. (Back in 2008, she posed for a C.O.D. Trees, Inc. calendar wearing just a scarf and bikini bottom.)

"We are not in negotiations with her and have not made her an offer," the Playboy rep adds.

Even if Jake Pavelka's ex-fiancee won't be taking it off for a quarter of a million dollars, the single gal does have some income: she just started a new job with haircare line Biolustre. "She's a hard worker," chief operating officer Leonard Buchanan tells Us.