The star, 33, revealed his make-up secret talking about his new role as a judge on ITV talent show Let's Get Gold.
Referring to looking good in front of the cameras, Rio said: "It's part and parcel of what happens when you sign up to do this.
"You know you're going to have to put it a bit of make-up on, bit of lipstick and stuff.
"I think I'll get the mick taken out of me a little bit after a couple of the things that have gone on.
"The most important thing is we're not afraid to laugh at ourselves."