Christina Aguilera celebrates fiance Matthew Rutler’s 39th birthday in Las Vegas with friends Anitta and Dita Von Teese

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Christina Aguilera took to Instagram on Sunday to share some photos from her fiance Matthew Rutler’s birthday celebration in Las Vegas.

The MasterClass director turned 39 on April 5, with his 43-year-old fiancée Aguilera sharing photos from the couple’s birthday celebration in Sin City.

Aguilera – who opened up about sex secrets recently – shared nine photos and a video in a new post on Sunday, which she captioned “Midnight things.”

The first image was a black and white photo of a smiling Aguilera posing with her friend and singer Anitta.

She also shared a Polaroid photo of Anitta and makeup artist Vinicius Duarte engaged in conversation.

Christina Aguilera took to Instagram on Sunday to share some photos from her fiance Matthew Rutler's birthday bash in Las Vegas

Christina Aguilera took to Instagram on Sunday to share some photos from her fiance Matthew Rutler’s birthday bash in Las Vegas

The MasterClass director turned 39 on April 5, with his 43-year-old fiancée Aguilera sharing photos from the couple's birthday bash in Sin City

The MasterClass director turned 39 on April 5, with his 43-year-old fiancée Aguilera sharing photos from the couple's birthday bash in Sin City

The MasterClass director turned 39 on April 5, with his 43-year-old fiancée Aguilera sharing photos from the couple’s birthday bash in Sin City

Next was a video of the conversation with Duarte seen laughing as Anitta continued to speak.

The next slide was a black and white polaroid of Xtina and her partner since 2014 admiring his birthday cake.

Next up was a color photo of the couple admiring the impressive birthday cake as they celebrated in Las Vegas.

The next photo showed Aguilera posing with another famous friend, Dita Von Teese, wearing a stylish black dress.

Next was a color image of the first black and white photo of Xtina and Anitta, both dressed in all black.

She also shared a photo from her Can’t Hold Us Down music video, along with a black-and-white photo of Rutler blowing out the candles on her birthday cake.

The final image was a black and white photo of the cake being cut that read, “Happy Birthday Matt!”

Christina Aguilera made jaws drop when she made a series of subtle revelations about her experimental sex life during an X-rated episode of the Call Her Daddy podcast in April 2023.

Next was a video of the conversation with Duarte seen laughing as Anitta continued to speak

Next was a video of the conversation with Duarte seen laughing as Anitta continued to speak

Next was a video of the conversation with Duarte seen laughing as Anitta continued to speak

The next slide was a black and white polaroid of Xtina and her partner since 2014 admiring his birthday cake

The next slide was a black and white polaroid of Xtina and her partner since 2014 admiring his birthday cake

The next slide was a black and white polaroid of Xtina and her partner since 2014 admiring his birthday cake

The next photo showed Aguilera posing with another famous friend, Dita Von Teese, wearing a stylish black dress

The next photo showed Aguilera posing with another famous friend, Dita Von Teese, wearing a stylish black dress

The next photo showed Aguilera posing with another famous friend, Dita Von Teese, wearing a stylish black dress

She also shared a photo from her Can't Hold Us Down music video, along with a black and white photo of Rutler blowing out the candles on her birthday cake

She also shared a photo from her Can't Hold Us Down music video, along with a black and white photo of Rutler blowing out the candles on her birthday cake

She also shared a photo from her Can’t Hold Us Down music video, along with a black and white photo of Rutler blowing out the candles on her birthday cake

During the chat, the 43-year-old Dirrty hitmaker revealed she’d had sex on a commercial flight ‘under blankets’ and ‘bent over a soundboard’ in a music studio – before shocking host Alex Cooper by declaring her crush on a certain sex act.

Xtina – who has been engaged to Matthew Rutler since 2014 – kicked off the chat by revealing that she loves performing fellatio, saying it’s “really important to be with a partner where you can really explore.”

She said: ‘Sexuality is a very specific thing, so what one guy might like, another guy might not’ – while adding intimacy has ‘many different levels’.

The star also detailed losing her virginity, saying: ‘It’s so funny that I gave this persona because I was probably the last person to lose my virginity.