Usher caught sneak peeking at Kim Kardashian's behind on the red carpet at the MTV VMAs in LA on Sunday

She has arguably the most famous derriere in the business, save for JLo.

And Kim Kardashian's ample asset drew more than a few stares at the MTV VMAs on Sunday night, most notably from another famous face.

Singer Usher, 35, was seen sneaking a peek at the 33-year-old reality star's behind while the pair stood back-to-back on the red carpet before the event in Inglewood, California.

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The My Boo singer was seen craning his neck around, before appearing to give the seal of approval, judging by his pursed lips and raise eyebrows.

Kim seemed oblivious to her admiring onlooker, smiling for the camera while showing off ample cleavage in a plunging Balmain Resort 2015 mini dress.

Black ankle boots gave the look an edge and showcased her toned and tanned legs

Leaving little to the imagination: Kim seemed oblivious to her admiring onlooker, smiling happily for the camera while showing off ample cleavage in a plunging Balmain Resort 2015 mini dress

During the show, Usher performed She Came To Give It To You with Nicki Minaj, before debuting a new song called Believe Me. 

Kim, meanwhile, was on hand to introduce British singer Sam Smith to the stage, where he performed his hit Stay With Me.

She was joined by her sisters Kendall and Kylie Jenner, and the trio were seen singing along and dancing together during Sam's performance.

White nights: Usher performed She Came To Give It To You with Nicki Minaj, before premiering a new song called Believe Me

Her moment in the sun: Kim, meanwhile, was on hand to introduce British singer Sam Smith to the stage, where he performed his hit Stay With Me

Best supporting act: She was joined by her sisters Kendall and Kylie Jenner, and the trio were seen singling along and dancing together during Sam's performance

After taking a seat back down, Kim and Kendall were caught on the 'Give The Person Next To You $5 Cam.'

And sure enough, the wife of Kanye West was seen handing a five-dollar bill to her younger sibling, as Ireland Baldwin and Angel Haze laughed in the background

Later that evening, Kim almost suffered a wardrobe malfunction as her dress gaped open at the after-party at Craig's in West Hollywood on Sunday night.

Kim took a moment to adjust her low cut ensemble, but it didn't stop her flashing a great deal of her pert cleavage to waiting fans and photographers.

Oops: Kim almost suffered a wardrobe malfunction as her dress gaped open at the after-party at Craig's in West Hollywood on Sunday night

Usher's not the only one! A police officer was seen checking out Kim's serriere as she left a building in NYC last week 

Via Dailymail