It's official...Backstreet's back! While performing at a concert at London's O2 arena, the boy band announced that their former band member, Kevin Richardson, will be permanently re-joining their group.

Richardson left the Backstreet Boys in 2006, after spending 13-years with the group. According to themusicnetwork.com, Richardson had left to pursue other interests.

The former group member recently tweeted a photo, that further fuels his plans to return to the 90's boy band that had almost every girl screaming. Richardson's photo is of a studio mixing board with the caption, In the studio, Muscle Shoals Alabama putting some stank on it.

Backstreet's other four members, Nick Carter, A.J. McLean, Howie Dorough and Brian Littrell, have been on tour with another 90's boy band, New Kids On The Block.

At the sold out O2 arena (which was also being live streamed worldwide), the group revealed that in July they would be returning to London to record their eighth album, which Richardson would be featured on.

According to Music Week, the Backstreet Boys are the biggest-selling boy band of all time with worldwide sales in excess of 100 million.

Some of the group's former hit songs include, Quit Playing Games (With My Heart), Everybody (Backstreet's Back), and I Want It That Way.

This year seems to be the year for boy band reunions. At the beginning of April, TMZ reported that the fake MTV boy band, 2Gether, are getting back together. Alex Solowitz, who played the bad boy Mickey in the faux band, told TMZ that in May they will have a Los Angeles performance after a decade of being out of the lime light.

Rumors of 98 Degrees going on tour this summer were circulating, but former band member Nick Lachey shot down the rumors of a summer tour due to his pregnant wife, Vanessa Minnillo.

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