Credit: RK/Splash News Photo: Lisa Vanderpump Flashes a Grin at a Breast Cancer Research Benefit Luncheon on May 4, 2011

Lisa Vanderpump might look like a brunette Barbie, but she isn’t made out of plastic.

That’s what the sassy Brit is saying in her new book, Simply Divine: A Guide to Easy, Elegant, and Affordable Entertaining. The 51-year-old reality star says she works hard for her physique, like anybody else.

"How do I keep it all together?... Sorry, it’s not plastic surgery — unusual for Beverly Hills, I know! I get up early and get my arse on the treadmill every single day,” she writes.

However, Lisa isn’t completely all-natural; the always-clever reality star admitted to having a “bucket of Botox” during an interview with Sirius XM radio’s Judith Regan last year.

So what do the experts say? Dr. Michael Salzhauer, a Miami plastic surgeon, tells the OC Register he thinks Lisa’s had a “bucket” of other procedures, too. “It looks as if Lisa Vanderpump has received Botox to her forehead, fillers to her lips and possibly cheeks, and a rhinoplasty giving her that very straight nose,” he said, adding that Lisa’s still been “very conservative with her cosmetic enhancements” and looks “beautiful and natural.”

Beverly Hills plastic surgeon, Dr. Toby Mayer, “doubts” the nose job claim, and says Lisa “shows no obvious signs of any fillers.”

Source: OC Register