Beyoncé looks thinner than ever in black thong and sheer bodysuit at Grammy Awards... and gets VERY cheeky with husband Jay Z on stage

She successfully completed a 22 day vegan diet challenge with her husband Jay Z last month.

And Beyonce revealed her dramatically slimmed down figure as she took to the stage at the 2014 Grammy Awards on Sunday night in Los Angeles to perform a very raunchy rendition of her hit song, Drunk In Love, alongside husband Jay Z.

Wearing just a black thong and a sheer bodysuit for the performance, the 32-year-old looked super slender in her barely-there ensemble.

The outfit, which featured criss-cross detailing at the front and the sides, also showed off the singer's trim middle.

In addition to a thong, Beyonce wore a glittering bra underneath that had slightly slipped down to reveal what appeared to be a pair of glittery pasties.

Crystal embellished fishnets, wet hair and smokey eyeshadow added even more dramatic effect to the saucy attire.

From start to end, Beyonce's performance could only be described as sultry.

She opened up the performance sitting straddled on a chair, which she then proceeded to writhe around on.

Belting out the lyrics to the explicit song, many of which were bleeped out to ensure the show was suitable for younger viewers, it wasn't too long before she was joined by her husband, who looked dapper in a black spotted tuxedo, onstage.

Getting up from the chair, Beyonce then embarked in a spot of back-to-back slow and sexy dancing with her husband, running her hands up and down his leg and bottom.

And the 44-year-old rapper also couldn't help but get touchy feeley with his wife, clasping his hands on her own famous derriere and giving her a kiss mid song. 

This is certainly not the first time the pair have collaborated together.

Not only does Jay Z cameo on Beyoncé's new single Drunk In Love, she sang on his Grammy-nominated song Part II (On The Run).

In the past, Jay & Bey have also collaborated on tracks like 03 Bonnie & Clyde, Crazy In Love, and Déjà Vu.

The 16-time Grammy winner - born Shawn Carter - is up for eight other Grammys on Sunday, including Best Rap Album for Magna Carta... Holy Grail.

Jay Z took home an early award during the ceremony as he scooped the prize for Best Rap/Sung Collaboration along for Holy Grail, featuring Justin Timberlake.
After planting a celebratory kiss on his wife's lips, the star dedicated his award to their two-year-old daughter Blue Ivy, and sweetly said he now has 'a gold sippy cup' for her.
By that point Beyonce had changed into a glamorous dress, which was just as show-stopping as her performance ensemble.
The star, who skipped the red carpet, wore a stunning Michael Costello gown which hugged her figure in all the right places.

The dress was backless, long-sleeved and white lace, with a strategically placed sheer panel across her thighs.
Beyonce had also had her hair brushed out to give a more natural look and slipped on some deep crimson lipstick, while Jay Z kept his classic tuxedo on.
Meanwhile, the 17-time Grammy winner's self-titled fifth album Beyoncé has reportedly sold 1.5 million copies.
The couple embarked upon their 22 day vegan challenge on December 3, a day before the Hard Knock Life rapper's 44th birthday, which he announced on his Life + Times blog.

'Psychologists have said it takes 21 days to make or break a habit. On the 22nd day, you’ve found the way,' he wrote.
'On December 3rd, one day before my 44th birthday I will embark on a 22 Days challenge to go completely vegan, or as I prefer to call it, plant-based!! This all began a few months back when a good friend and vegan challenged me to embrace a plant-based breakfast every day. It was surprisingly easier on me than I thought…'
The timing of it felt right, he said.