Karen Mulder  model ass  beach behind
Karen Mulder  model ass  beach behind Spread Pictures

I guess this is why she's a supermodel!

Karen Mulder hit the beach in St. Barths with her daughter Anna yesterday, and the Dutch stunner looked half her age in a skimpy sarong!

The catwalker is now retired from the industry, but we think she needs to give that decision a second thought after seeing these photos!