Oh no! First her boobs and now CAMERON DIAZ has a plastic NEW face says  a top plastic surgeon who damn well knows his Botox from beeswax!

Cameron turned the Big Four Oh -40- in August, and shocking new pix suggest the blonde beauty has now done more than wash “Bad Teacher” out of her hair!

"There's something about Cameron Diaz’s face that is very unusual," celeb plastic surgeon Dr. Anthony Youn, who has not treated Diaz, told

"She looks like she's preparing to take her costar Jim Carrey’s role in The Mask!"

As The ENQUIRER previously reported, it was less than a month ago when the former flatty sparked speculation that she had gotten breast implants after baring her bounty in new bikini pix.

Cameron unveiled her startling new look at the 2012 Versace Spring/Summer show during Paris Fashion Week, where she gave Donatella Versace a run for her money in the fake stakes!

"Her forehead is excessively smooth, a possible consequence of overdone Botox injections," Dr. Youn added.