Justin Timberlake played to a star-studded audience at his exclusive post-BRIT Awards gig in London last night (20.02.13).

The 'Suit & Tie' singer - who made his British musical comeback performing at the BRIT Awards at The O2 - serenaded an intimate audience, including wife Jessica Biel, 'Baby' hitmaker Justin Bieber and actress Gemma Arterton, following the bash in an exclusive one-off concert at the HMV Forum in Kentish Town, north London.

An excited reveller told BANG Showbiz exclusively that 'Boyfriend' singer Bieber, 18, arrived discreetly at his namesake's concert midway through the show, flanked by security guards and perched himself on the celebrity-packed upper tier balcony, where the singer appeared to be enthralled by Timberlake and sang along to his 2006 song 'Until the End of Time'.

Bieber - who was clad in his trademark baseball cap, sunglasses, hoodie and a white T-shirt - didn't look at or talk to any of his fellow concert-goers and was solely concentrated on the stage.

The Canadian singer, who is in London for the latest dates on his 'Believe' world tour, didn't stay for long as he made a swift exit after just 10 to 20 minutes - before Timberlake, 32, performed his new single, 'Mirrors', which he also sang earlier in the night at the BRITs.

Surrounded by a flock of security, Bieber tried to make an incognito exit but turned heads as he tripped over one of his bodyguards and nearly fell.

'Total Recall' actress Biel clearly enjoyed seeing her husband on stage, as she was on her feet all night singing along and dancing, and was seen happily smiling and waving at excited fans.

An onlooker said: ''She knew the lyrics to all of his songs. It was so sweet. She was looking at him very lovingly.''

The 30-year-old screen beauty also shared a chat with former Bond girl, Gemma, 27.

Other stars who attended the concert included all four members of JLS - J.B. Gill, Marvin Humes, Aston Merrygold and Oritse Williams - as well as Sir Tom Jones and Kelly Brook.

As well as performing songs from his new album 'The 20/20 Experience', Justin thrilled fans with his greatest hits, including 'Cry Me a River', 'What Goes Around' and 'Like I Love You'.