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21 February 2013, 11:51
The 'Believe' singer was wowed by 'Suit & Tie' singer Justin's one-off live show in the UK capital.
Justin Bieber was just one of many huge stars who turned out to watch Justin Timberlake's one-off performance at The Forum in London last night (20th February).
The 'Boyfriend' singer did not attend the BRIT Awards 2013 earlier in the evening, where 'SexyBack' singer Justin performed his new song 'Mirrors' live on stage, but did make it to the US star's Kentish Town concert straight after the awards show.
The Canadian star was spotted heading into the venue, accompanied by a mystery brunette, dressed in aviator shades, a baseball cap, gold chain, grey hoodie and blue jeans for his night out on the town in London.
"@jtimberlake great show last night. #muchrespect," Justin tweeted to The Social Network star, after watching him perform some of his biggest hits live on stage.
Check out a picture of Justin Timberlake performing live on stage at The Forum in London last night below:
The likes of JLS stars Aston Merrygold and JB Gill and model Kelly Brook were also in attendance at the highly anticipated gig, with the UK boy band tweeting their verdict straight after the show.
View a picture of Justin Bieber arriving ready for Justin Timberlake's gig below (Credit: Splash):
"JT killing it right now…Summer love and all sorts! Makes me wanna get the decks out and do my 2nd mix tape!!" Marvin Humes posted, while Aston tweeted: "I dare someone to tell me Justin isn't the greatest jheeeeeeeeeze are u mad! He's going in like it's 1999 Ax."
Justin Bieber is in the UK after bringing his 'Believe' world tour across the pond and is set to perform a live show tonight (21st February) at the Manchester Arena.