Jessica Biel joins Justin Timberlake at 'In Time' premiere party

Justin Timberlake and Jessica Biel have fuelled rumours that they have reunited by attending the LA premiere of In Time together.

The pair were joined by friends at the premiere after-party for Timberlake's latest movie on Thursday night, when eye-witnesses spotted the actor and Biel openly expressing affection for one another throughout the evening.

The insider told People: "[They] became more and more affectionate, sneaking kisses, whispering to each other, and sharing quick back rubs and caresses.

"At one point, she pretended to punch him a couple times and he gamely bounced up and down like a jack in the box."

Timberlake and Biel dated for four years, but their reps announced in March that they had decided to "part ways".

The stars were first reported to have reconciled after they were spotted on a series of dates in Toronto in September, followed by a vacation in Colorado.

Representatives for the stars have not confirmed their romantic status.

Timberlake's new thriller In Time opens on October 28 in the US and November 1 in the UK.

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Watch an In Time trailer below: