But the TV presenter has shed that image in a provocative new photoshoot... and even reveals her rock'n'roll side, admitting that she once trashed a hotel room.
The 34-year-old frolics on a bed and plays up in Mickey Mouse ears and swimsuits for the photoshoot for men's magazine Esquire.
‘Oh God, I don’t even think I can tell you about it,’ a coy Cat tells the magazine.
‘All I’ll say is that it was in the States, I wasn’t alone, we left in the middle of the night and the room was trashed.
And while she revisited her wild night in the playful photoshoot, Cat also dished out advice to male - and female - readers, for spicing things up in the bedroom.
The So You Think You Can Dance host tells men: 'My advice is don’t go for the predictable. The big thing with women is that all the good stuff happens in their brain, so a little imagination is required.'
And for her fellow women, she opines: ‘If you’re smart and you think outside the box, it’s a lot more of a turn-on than a set of bog-standard, uncomfortable lacy underwear.
‘So I’d rather go, “Hold on, I’m just going to slip myself into something more comfortable” and come back with a totally out-there fandango.’
One of those kinky items is a top hat, she said. ‘I wore one when I was hosting the Brit Awards. I’ve still got it and, let me tell you, it still makes an outing.’
Cat is currently single after her split from long-time boyfriend Jack Huston last July, but with a hectic work schedule and splitting her time between London and LA, Deeley hasn’t had time to begin a new relationship.
While she's apparently happy to rip apart a hotel room, one thing she doesn't own up to doing is watching the adult films on offer.
But she does confess: ‘Everyone looks at the free trailer, don’t they? I’m not paying for it!’
Cat is back in London to film the second series of So You Think You Can Dance, which will air this month.
After hosting the US version, she’s back to continue hosting the UK version and will be joined by judges Nigel Lythgoe, Arlene Phillips, Louise Redknapp and Sisco Gomez.