Many years ago, when Katie Price was Jordan, I saw a TV documentary where she went to work at a stables for a week as a supposed new staff member - she is or was mad about horses - and went totally without makeup, dressed in old jeans and sweatshirts etc. She was incredibly hardworking and industrious and nobody clocked that it was her, except for one young bloke who told her she really looked like Jordan....she just laughed it off.
At the end of the week she revealed who she really was, to general amazement, but tbh I was very impressed by how well she came across then.