Justin Timberlake has been spotted in the studio with Jay-Z and Pharrell Williams.

The US star is preparing to release the second volume of his comeback album 'The 20/20 Experience' in September and it seems some esteemed guests might make an appearance.

Pharrell Williams, who has enjoyed recent success with cameos on Daft Punk's 'Get Lucky' and Robin Thicke's 'Blurred Lines', posted an image of himself with Timberlake on Instagram.

A&R man Lenny Santiago then posted online a photo of the 'Suit & Tie' man with previous collaborator Jay-Z, Timbaland and Nas.

As previously reported, Timberlake has picked the track 'Tunnel Vision' as the next single to be taken from 'The 20/20 Experience'.

The singer and actor meanwhile will host this year's Capital FM Summertime Ball event at London's Wembley Stadium on June 9.