Where early photos depict fresh-faced young men anyone could take home to meet their mums, they now boast tattoos on almost every exposed patch of skin.
I think boybands tiptoe the edge of being exciting outlaws who fans would still want to take home to meet their mums.
Meanwhile, the American sings the song looking as if he's worried what his parents will think, suggesting that the real Robin Thicke is (gulp) a nice polite young man anyone could take home to meet their mum.
This is how it works: when you hit the really big time and get to be a judge on a US network TV show, other famous people just ring you up and invite you to meet their mum.
She looks puzzled: "Well, I've met mums who were told by their friends not to pick up their crying babies, even though their instinct was shouting at them to do it.
Sir Robin Wales, Mayor of Newham, had met the mums before.
The only people she ever met were other mums, lawyers and her manicurist.' But did she never suspect that Raghad knew more about her father's brutality than she was willing to reveal?
My stepdad was a woodwind teacher and met my mum when he gave her lessons.
Then I met her mum and she talked over me, too.
