Nope. Diamond would have had to have major facial surgery to pull this off. Her eyes are slanted differently. O’s nostrils are smushed more D’s or more round. D’s Upper lip is radically different too, where O’s almost look symmetrical. Not impossible but no, it’s not a mask either. Sure, Diamond could lose weight and that would affect facial features also but not this extreme.

Oprah did red carpet interviews prior to the broadcast (you can find them all over the entertainment networks YouTube channels) too many to link to.