The superstar’s grand entrance to the early birthday event included one of her boobs falling out of her cowl-necked, ruby red dress not once but twice.

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Christina spilled out of her dress while she was dancing at her birthday partyCredit: Instagram/Xtina

The first time was accidental, while the second was all Christina.

In a party recap video she posted to Instagram on Wednesday, her actual 39th birthday, the “Fall in Line” singer can be seen dancing her way into the affair, not realizing the wardrobe malfunction for a few seconds.

As the singer has been wearing a lot of plunging necklines recently, and posting photos of them on Instagram, she was prepared for the mishap and covered up with pasties.

After dancing for a little bit while spilling out, she covered herself back up before quickly giving her guests another quick glimpse, this time of her own accord.

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Christina shared a snap of herself in a deep v-neck outfit on InstagramCredit: Instagram

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The singer was surprised when she realized what had happenedCredit: Instagram/Xtina

She covered up before briefly pulling her dress down to show off her breast againCredit: Instagram/Xtina
Putting the incident behind her, the rest of the video shows the “Burlesque” actress enjoying the major blowout with all of her friends — including Demi Lovato and her boyfriend Austin Wilson.

There were glittery-pink balloons, twinkle lights, a cake fit for a superstar and plenty of drinks and dancing.

Christina captioned the recording: “Entering the last year of my 30s with the best vibes…dancing, singing, salsa-ing. What a night.

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Christina officially turned 39 on WednesdayCredit: PA:Press Association
“SO thankful for everyone in my life who’s been on this journey with me. Who has stuck by me through and through. ‘She came, she conquered. Get ready 2020.’”

Her Instagram feed has been filling up with plenty of birthday party content, including group shots of her and her guests, magazine-style photoshoot pictures and more videos.

Most recently, she shared a new clip on Thursday of her telling her guests how much she loved the past year and how excited she is about the new one to come.

Along with it, she wrote: “This year, I have felt more inspired than ever. Getting back to my roots, creating art, and feeling so in tune with myself.

“…From traveling around the world, #TheXTour and #TheXperience, getting to meet and hug the fans, I feel grateful for the present and looking forward to the future. 2020 is gonna be a big year.”