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17 December 2013, 09:23 | Updated: 17 December 2013, 09:29
The 'SexyBack' star sends the audience wild when he invites the couple on stage for the emotional moment.
Justin Timberlake stopped one of his shows in Louisville this week as he helped a would-be romantic propose to his girlfriend in the middle of the gig.
The 'Cry Me A River' star pointed out to Josh – who then waved to the audience whilst wearing his unmissable bright green shirt.
He explained he had attended the show with girlfriend Kim, which then led Mr JT to say: "Josh called me earlier, he's got something he wants to tell you."
Screams echoed around the arena as the couple were invited on stage and Josh got down on one knee to make the proposal.
She quickly accepted sending the 22,000 in attendance wild once again.
Justin continues his 'The 20/20 Experience' world tour tonight (17th December) in Atlanta with a show at the Phillips Arena.
He will bring the outing over to the UK in March and April 2014.