Mariah Carey, 49, has a very slender waistline these days.

And the diva flaunted her trim figure in a stunning Instagram post shared this weekend.

Though Carey has never commented on her weight loss nor confirmed having weight loss surgery, ET claimed last year that she had undergone gastric sleeve surgery in late 2017.

In shape: Mariah Carey, 49, has a very slender waistline these days. And the diva flaunted her trim figure in a stunning Instagram post

The operation allegedly took place in November 2017.

A source to the site that she ‘needed a fresh start and she is getting just that.’

‘She truly feels her weight loss surgery paid off because she is at her happiest when she is thin,’ the source said.

‘She has always struggled with her weight. In the last five years it has become more and more difficult for Mariah to shed the pounds,’ the source added. ‘She has a huge career, children, and she has been through big changes with her team. It’s truly been an emotional roller coaster and that always affects her weight, both gain and loss.

‘Mariah is known for her yo-yo dieting. When she has a big project coming up, she works so hard to lose weight. She often becomes incredibly stressed out and barely eats. Then the moment her project is complete, she lets loose and enjoys all her favorite foods, champagne and the weight gain returns,’ the source claimed.

Glam slam: And her long blonde hair looked perfectly groomed as it cascades down her front

In her new image, Carey had on a very clingy pink and nude toned gown that was plunging on front and had a soft mermaid finish. And her long blonde hair looked perfectly groomed as it cascades down her front.

She wore the same gown on Thursday evening during the final show of her Las Vegas residency.

Putting on a spectacle inside The Colosseum at Caesars Palace, the songstress showed off her eye-popping curves in a slew of slinky gowns.

Wow: Carey continued to wow concert-goers as she entertained at the final show of her Las Vegas residency on Thursday night

Mariah teamed one figure-hugging sparkly red sequin gown with a matching fur stole.

She was primped and preened to perfection with a glamorous slick of make-up, while accessorising with drop silver earrings.

The We Belong Together hitmaker later changed into an equally clingy silver dress as she showcased her vocal prowess.

Red hot: Mariah teamed one figure-hugging sparkly red sequin gown with a matching fur stole as she put on a spectacle inside The Colosseum at Caesars Palace

This comes after The Chainsmokers’ Alex Pall claims Mariah once confused his group with One Direction, according to Alex Pall of the musical duo – and she responded Wednesday.

Pall, 33, who comprises the EDM-pop duo with Andrew Taggart, 29, told The Morning Mash Up Wednesday about their run-in with the 48-year-old pop diva.

‘I was like ‘Oh my God! Like, Fantasy and Honey!” he said, referencing two of her hits. ‘And she was like, ‘Dude, I love you guys!”

Unaffected: This comes after The Chainsmokers’ Alex Pall claims Mariah once confused his group with One Direction; seen in October

One of her 2 kids: Carey is seen here with her son Morocco in a sweet Instagram snap