Justin Timberlake, Mila Kunis 'grope' at MTV Awards

Mila Kunis and Justin Timberlake poked fun at rumours they are dating during an appearance at the MTV Movie Awards.

The Friends with Benefits stars took to the stage at the ceremony on Sunday night to present the 'Best Male Performance' prize.

Timberlake said: "Even though we are in the movie Friends with Benefits, Mila and I have never dated."

"No, we are like brother and sister," agreed Kunis.

Timberlake then described their relationship as "totally platonic", adding, "This is why I can do this" before grabbing Kunis's breasts.

"And it's why I can do this," retorted Kunis, who grabbed the star's crotch in retaliation.

Friends with Benefits, which also stars Andy Samberg and Emma Stone, is released July 22 in the US and September 2 in the UK.

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Watch a video of Justin and Mila presenting at the MTV Movie Awards below (US only):