Christina Aguilera surprised on her 44th birthday with a sexy “birthday suit” snapshot.

On her official birthday, the Dirrty singer celebrated her special day on Instagram with a seductive black and white photo that left fans drooling.

In the photo, Christina squatted seductively while showing off ample cleavage.

She was wearing a pair of hot pants but was topless, with only her hand protecting her privates.

She wore little clothing other than her underpants – her feet were in strappy sandals, while a messenger cap sat atop her blonde curls.

“Birthday suit #44,” the singer, who recently performed at a Sabrina Carpenter concert, captioned the post.

Christina Aguilera surprised on her 44th birthday with a sexy “birthday suit” snapshot

Fans were stunned by the sexy picture and some commented on her youthful looks.

“Getting years older but looking younger is what I’m talking about!!!!” one gushed.

“Oh darling, he doesn’t feel the same as you!!! Fabulous! “Happy birthday queen,” gushed another.

“Oh my god…happy birthday queen,” another posted, adding: “Hawt hawt pic as always.”

“OMG,” one fan simply said with two flame emojis.

“HB Queen,” wrote another, “If the 40s are the new 20s, things are looking better than ever!”

“Happy 24th birthday queen,” said another.

“Queen,” declared another.

Fans were stunned by the sexy picture and some commented on her youthful looks

One person who will definitely appreciate the photo is Christina’s long-time partner, her fiancé Matthew Rutler.

Christina and her film producer Matthew met on the set of the 2010 film Burlesque, in which she co-starred with Cher and he was a film assistant while she and her first husband Jordan Bratman were going through a painful separation.

After her relationship with Jordan ended in October 2010, she and Matthew began dating in November of the same year.

One person who will certainly appreciate the photo is Christina’s long-time partner, her fiancé Matthew Rutler; pictured in September

Christina and her film producer Matthew met on the set of the film Burlesque in 2010

Matt popped the question back in 2014 in a romantic Valentine’s Day proposal. They then welcomed a daughter named Summer Rain Rutler.

Christina also has son Max from her previous marriage to Jordan. The couple married in 2005 and separated five years later. The divorce was finalized in April 2011.

Prior to her time with Jordan, Christina dated her backup dancer Jorge Santos between 2000 and 2002, which was her first public romance.

The “Genie In A Bottle” star was also previously linked to Limp Bizkit singer Fred Durst after he reportedly asked her to be his date to the 2000 VMAs.