Eli from U-KISS excitedly tweeted a photo of the Korean idol group and the American boy band while in Malaysia. The groups performed at the F1 Malaysia Grand Prix this year along with pop star Demi Lavato and many other artists. The pop icons gave amazing performances and made many fans happy. What are some of your favorite U-KISS and Backstreet Boys songs? Tell us in the comments below. (Source: @u_kisseli)