'Festivating dahlings!' Racy Mariah Carey posts festive shirt and bra selfie... before singing along to own song in lingerie with son Moroccan

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She's the queen of glamorous selfies.

And Mariah Carey didn't disappoint as she took to Instagram on Friday night, clearly feeling in the festive spirit.

Sharing a video of herself dancing around in her underwear with son Moroccan on Thursday, she added an even racier selfie on Friday posing in just a bra and shirt.

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Santa's sexy helper! Mariah Carey didn't disappoint as she took to Instagram on Friday night clearly feeling in the festive spirit a she posed in a bra and shirt

Adding the caption 'Festivating dahlings', Mariah posed in front her glowing Christmas tree, putting on a very busty display as she showed off her diamonte bra.

Teaming it with nothing but a loose red checked shirt and fluffy boots, Mariah gave a glimpse of  her toned thighs as she knelt on the floor clutching a glass of milk presumably for Santa. 

With her golden tresses in loose waves, she sported a full set of lashes and generous helping of bronzer as she smiled for the camera. 

Proud parent: She also shared a video as she danced around in her underwear with son Moroccan on Thursday

Earlier this week, the 46-year-old superstar posted a video as she cooked in nothing but her lingerie and red dressing gown.

Cooking her 'favourite sauce' with her song All I Want For Christmas blaring out in the background, her adorable son Moroccan was seen dancing around in the background miming his mother's hit.

'Merry Christmas everybody! I'm making my favorite sauce and I hope you're enjoying the Yuletide cheer!' she wrote alongside the snap. 

'Merry Christmas everybody! I'm making my favorite sauce and I hope you're enjoying the Yuletide cheer!' she wrote as her adorable son Moroccan was seen dancing around in the background miming his mother's hit

Doting mother: Mariah shares cute twins Moroccan and Monroe, 5, with ex husband Nick CannoN

Mariah shares cute twins Moroccan and Monroe, 5, with ex husband Nick Cannon. 

The star also posted a video to her Mariah's World website of herself singing an even more popular carol.

Wearing a sparkling white dress that appeared superglued on, she gave an electrifying rendition of the 1818 number Silent Night. 

'Sleep in heavenly peace': On Friday, Mariah posted a video to the Mariah's World website of herself singing the 1818 Christmas carol Silent Night

The diva's gown featured an intricate floral pattern and several snatches of sheer fabric, including one that exposed a generous amount of cleavage.

Her hair teased into fine curls, she garnished the outfit with a dazzling diamond necklace and matching bracelet. 

She was accompanied by a sunglasses-wearing pianist who hammered out the bluesy arrangement at a white baby grand, as well as by a chorus.

Ensemble: She was accompanied by a sunglasses-wearing pianist who hammered out the bluesy arrangement at a white baby grand, as well as by a chorus

Carey principally stuck to the final verse from John F Young's iconic 1859 translation of the original German lyric by Joseph Mohr.

Taking, as she does, whatever liberties she pleased with Franz Xaver Gruber's tune, she got in a few belt notes on such phrases as 'Son of God' and 'Jesus, Lord.'

At other points, she fell into her trademark breathy melismata, getting quite a lot of mileage in particular out of the word 'grace.'

Dazzling: The diva's gown featured an intricate floral pattern and several snatches of sheer fabric, including one that exposed a generous amount of cleavage

Once she wrapped up that bit of the song, though, she cast back to the famous final line of the first verse: 'Sleep in heavenly peace.'

She wound up singing the line over and over again, each melisma more extravagant than the last, occasionally popping round to her falsetto.

False snow drifted down onto a set that included several lightbulb-strung Christmas trees and a smattering of lampposts. Behind what was meant to look like a large stone wall, the blue and green backdrops were occasionally visible.

 A splash of glitz: Her hair teased into fine curls, she garnished the outfit with a dazzling diamond necklace and matching bracelet

She'd posted a quick preview of the video to Instagram, teasing in her caption: 'Be sure to watch the 2nd of my three holiday gifts to you this week!'

As the Instagram clip made clear, the first was a rollicking production of her singing Here Comes Santa Claus, already filmed and posted to her website.

The next one, with a currently unannounced release date, will see her return to her Silent Night set to crow through Joy To The World.

Backdrop: False snow drifted down onto a set that included several lightbulb-strung Christmas trees and a smattering of lampposts