AceShowbiz -

Has Pamela Anderson gone under the knife? The former "Baywatch" babe has left fans wondering if she has got plastic surgery done on her face after she was pictured looking unrecognizable during her recent night out in London, where she put a generous amount of cleavage on display in a plunging floral dress.

Weighing in on what is up with the 49-year-old actress/model, plastic surgeon Dr. Moretz told HollywoodLife.com, "It looks like Pamela Anderson may have had a fat transfer, which brings volume to the face."

"Fat is taken from areas of the body that have excess fat, like the inner thighs or from in the bra line area," explained the expert. "The fat is then transferred via injection to various areas of the face. In Pamela's case it looks as though she may have had fat transfers to her forehead, her upper eyebrow ridge and to her upper eyelids."

"When someone has Hep C, like Pamela Anderson, they can begin to look gaunt and have a hollow looking face because Hep C is an autoimmune disease and it can cause fat loss," Moretz revealed. "So it would make sense for Pamela to get a fat transfer, which adds a youthful volume."

The plastic surgeon further noted that fat transfers could cost between $5,000 and $8,000 and that 50 - 60 percent of the fat transfer would be permanent. "After a procedure, the face can remain puffy and swollen for several weeks, which is perhaps the reason why Pamela's face looks so puffy," added Moretz.