ROYALS' NIP/TUCK SECRETS EXPOSED!

HOW KATE, FERGIE & MEGHAN RETAIN THEIR REGAL LOOKS

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KATE, DUCHESS OF CAMBRIDGE, 37

The mother of three young children looks even more stunning than she did eight years ago when she tied the knot with Prince William.

But New York City–based Dr. Yoel Shahar believes the rail-thin royal has filled out her face by adding “hyaluronic acid filler to her cheeks [to prevent sagging]. Mostly on the higher cheeks.”

Noting her smooth skin, Shahar added, “She also had Botox injections over her smiling lines and the crow’s-feet area to reduce the wrinkles.”