Usher admires the backview of sexy kim kadarshian during MTV VMA

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 MTVVMAs 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.