Pair have unlikely sparring sessions...
jason gregory
09:08 15th March 2011

Justin Bieber has said he “took it easy” on heavyweight boxing champion David Haye during a sparring session.

The two spent time in the ring on Monday (March 15) as Bieber arrived in the capital on his UK tour.

Posting a picture on Facebook, the teen star said: "Worked out with Boxing Heavyweight Champion of the World David Haye. I took it easy on him. haha. good times.”

Haye also posted the picture on his Facebook page, and told his fans that Bieber was a “natural athlete”.

He later wrote on Twitter: "You sure can pack punch!! I'm now a Belieber. Stay Blessed!"

Bieber played the first of three gigs at the O2 Arena in London last night – you can see photos below. For more details, check out Gigwise Gig Tickets.

Justin Bieber - live