Cheeky Justin Timberlake was reportedly caught catching a glimpse of Rihanna's rear during filming for their new video.  

The trousersnake star – who has been dating actress Jessica Biel for over 18 months – could hardly keep his eyes in his sockets when Rihanna bent forward, according to UK reports.

The sexy Disturbia star had been glammed up for the shoot, in super stilettos, stockings and various tops that barely covered her back side – tempting Justin to take a look.

Later the pair got physical writhing around on the bonnet of a car.

Justin reportedly got jealous of his girlfriend's sex scenes on the set of her new film Easy Virtue.

Revenge is sweet.