“What Do You Mean?” singer Justin Bieber, 21, is the latest pop star to perform songs by Marshall Mathers III, who is professionally known in the industry as Eminem, 43. On Dec. 6, Sunday, the Canadian pop star performed at the Jingle Bell Ball at the 02 arena in London.

After the Jingle Bell Ball, Bieber went on to perform at an impromptu show in London. During the after-party, he decided to sing two songs by Eminem instead of his recent singles “Sorry” and “What Do You Mean?”

Bieber climbed on the DJ's booth and performed Eminem’s hits “Lose Yourself” and “Cleaning out My Closet.” He was wearing a khaki baseball cap and black T-shirt paired with jeans, according to Mirror.

After singing his Eminem covers, Bieber hit the dance floor to dance to his song “Sorry.” The Canadian pop star clearly had fun celebrating after his gig at the Jingle Bell Ball.

Bieber and Eminem have yet to collaborate on a single. The Canadian pop star released his fourth studio album “Purpose” on Nov. 15 while the Detroit rapper last released “The Marshall Mathers LP 2,” his eighth studio album, on Nov. 5, 2013.

On Dec. 7, Monday, Bieber was at the Danforth Music Hall in Toronto for an acoustic show entitled “An Evening with Justin Bieber.” During the show, he performed his own hit singles, Christmas songs and covers of Drake, Tracy Chapman, Ne-Yo and The Beatles.

Bieber not only performed on a grand piano but also sang a cappella. His voice sounded great and he did not seem jet-lagged even if he just arrived from shows in London and in Tokyo on Dec. 4, Friday, according to Billboard.

The intimate acoustic show was attended by around 1,500 fans and it lasted for almost an hour and a half. Proceeds were given to the non-profit Stratford House of Blessing, which offers food, clothing and other resources to underprivileged people.

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