Group Super Junior's Kyuhyun and Kangin and group SHINee's Key and Minho supported Girls' Generation by attending their concert.

Girls' Generation Reveals Backstage Photo with Eunhyuk, EXO and Key From 2013 World Tour 'Girls& Peace' In Seoul [PHOTOS] 

Today, Kyuhyun posted on his Twitter, "I don't like doing Twitter this much lately but good job, SNSD. Go Sowon" along with a picture.

In the picture, Kyuhyun, Kangin, Key, and Minho in the waiting room of Girls' Generation's waiting room was revealed. They revealed their long years of friendship through this group picture.

Internet users who saw this commented, "They look really close," "Is Key the star of the night?," and "Girls' Generation looks so cute."

Girls' Generation held their concert '2013 Girls' Generation World Tour Girls & Peace in Seoul' on June 8.

Photo Credit: Kyuhyun Twitter