"I knew Bruce 30 years ago when he had his first operation," Hasselhoff told heat magazine.
"I'm glad to see that he's finally addressed it. He's always been a 'guy', but when he had his first surgery, it was kind of the talk between all of us. We were like, 'What?' We couldn't figure it out because he was such a good-looking guy.
"We were like, 'Why would he do something like that?' Now we know. I think it's cool."
Since joining Instagram and Twitter on June 1, Caitlyn has amassed 1.6m followers on Instagram and 2.45m on Twitter and now holds the record for the fastest growing Twitter account beating Barack Obama.
Caitlyn’s first public appearance as a woman will be on July 15 when she accepts an Arthur Ashe Courage Award at the ESPY Awards in Los Angeles.