Kevin Richardson joins Backstreet Boys and New Kids on the Block in Los Angeles

Stuff like this really makes us wish we still had a Lisa Frank Trapper-Keeper on which to scribble "I HEART BSB." It's often the only way to adequately describe our emotions.

Kevin Richardson, who left the Backstreet Boys amicably in 2006, got back together with his old buddies (and some new kids) for the July 1st Los Angeles stop of the enormous NKOTBSB tour at the Staples Center.

Richardson and the rest of the Backstreet Boys wore Lakers' jerseys, while the New Kids on the Block kept their Boston pride going with Celtics jerseys. Richardson joined former bandmates Brian Littrell, Nick Carter, A.J. McLean, and Howie Dorough on "I Want It That Way" and even participated in the big NKOTBSB finale.

Richardson jumped on Twitter for the first time since April after the show. "Beautiful night with my brothas on stage in LA," he wrote. "Much respect and love for the NKOTB. Thanks for making me feel welcome."

Richardson recently won an Independent Vision Award for Best Actor, for his role in "The Casserole Club," an indie film about a group of competitive 1960s housewives.