The 32-year-old mother of one looked beautiful as she promoted the new series of The Voice US on The Tonight Show With Jay Leno on Wednesday night (18 September).
Jay kicked off the chat by asking Christina about her recent sexy photoshoot for Maxim, where she said she's never been one to shy away from her sexuality.
"Everyone is different, but for me, I'm an artist and expressing myself in a sexual way – no matter how that changes through the years – has always been something that comes natural to me," she replied.
"At this point in my life I'm 32 and feel sexier than ever because I know what I want. I was in control of that shoot and it was about appreciating the woman I have become. It was effortless sexy, not trying too hard."
Jay also quizzed Christina about her comment in Maxim that she likes her man to take control in the bedroom.
"I'm a big micro manager," she explained. "I'm a stickler about organisation. Everything needs a place and purpose. So I think every woman should relax and allow herself to be pleased in the bedroom. It's the one place I can let go."
Christina is returning to The Voice US as a coach for its fourth season after taking the third season off to focus on other work commitments. (She was temporarily replaced by Shakira).
Aside from her work on The Voice (where her co-coaches are Adam Levine, Cee Lo Green and Blake Shelton), Christina is also busy being a mum to five-year-old son Max.
"He's amazing," she told Jay. "He's the biggest priority in my life. He's just starting a new school so we're at a transition stage. I bought a new house, he has a new school, it's a lot for the little guy, but he's great. He's the joy of my life."
Watch Christina's video for 'Your Body' below: