Writing alongside the first snap of her in the lacy number, with her cleavage on full display, she said: “Mmmmmmm what should I wear ???”

Clearly in the mood for a posing session, the mother-of-two quickly shared another snap, this time with her hands up to her chest as she looks off to the side.

10Mariah puts her hands to her ample chest in her risque ensembleCredit: Instagram10Mariah looks surprised in another social media snapCredit: Instagram

She wrote: “Oooooooh that might be pow!!” before writing: “Ughhhhh where are the shoes!!?!?” alongside a picture of her looking surprised as an assistant tweaked her hair style.

Mariah sported a fancy mortarboard in one of her fun snaps

Mariah’s next snap was even more random, as she posed with a fancy mortarboard next to her head which was decorated with butterflies and the words: ‘Spread your wings and fly butterfly’.

She captioned it: “Side note I graduated because of the fans tonight!!!”

Mariah then treated her fans to a full length of her final outfit choice, which consisted of the blackbra, skin tight black trousers, a black biker jacket and her trademark sky high heels.

10Mariah showed off her chosen ensemble once she had decided what to wearCredit: Supplied by PLANET PHOTOS

The star’s weight loss was clearly evident in the snaps, after she embarked on a healthy eating regime during her Sweet Sweet Fantasy World Tour earlier this year.

escribing it as ‘bleak’, she told The Sunday Times: “I overuse the word because there is a lot of bleakness going on.

10Mariah has lost a lot of weight in recent months on a “bleak” dietCredit: Instagram

“My bleak diet is horrendous, but I don’t want to tell anyone about it because it’s none of their business.”

Despite her strict regime, the Vision of Love performer was clearly in good spirits the whole day, as she had shared a video a few hours before of her popping a bottle of champagne.

10Mariah was in good spirits as she popped a bottle of champagne