Christina Aguilera has stripped down to her underwear to celebrate her 44th birthday.

On Wednesday, the Beautiful singer took to Instagram to share a black-and-white snap showing her posing in a black belt, stilettos, and a leather cap.

Christina had her arm draped across her chest as she looked directly at the camera with a sultry gaze.

The star simply captioned the sexy snap, "Birthday Suit #44."

Christina's birthday message quickly racked up over 250,000 likes, with many fans praising her confidence.

"Getting older in years, but younger in appearance is what I'm talking about!!!!" one follower gushed, while another user added: "Oh honey that are not doing like you!!! Fabulous! Happy Birthday Queen."

The steamy post comes several months after Christina took the opportunity to hit back at speculation surrounding her recent weight loss.

"I have a maturity now where I just don't give a f**k about your opinion. I'm not going to take it on," she said during an interview for Glamour magazine. "It must be your responsibility to take up your space. Other people's opinions of me are not my business."

Christina also noted that she doesn't want her two children, Max, 16, and Summer, 10, to have self-esteem issues like she did as a teenager working in the entertainment industry.

"Your kids trigger things in you that you don't want them to go through," the Stripped star added. "And it's almost like you're reliving this whole thing again."

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