On August 20th, KBS's idol singing show 'Immortal Song 2' aired its 'Best Friends Special' where contestants were asked to invite their best friends to join them on stage. With the concept of 'going on vacation with your best friend', viewers got to see stars with their celebrity friends.�Jay Park invited labelmates Jang Hyuk, Kim Soo Ro, and Solbi, while Super Junior's Kyuhyun invited his SM labelmate Kim Min Jong.�4minute's Jiyoon brought in actor Gong Hyun Jin, and MBLAQ's G.O. brought in actress Jo Yeo Jung.�As for SISTAR's Hyorin, she invited Music Bank MC Hyun Woo while Huh Gak invited actress Lee Si Young. The audience responded with cheers at the arrival of the unexpected guests. G.O. and Jo Yeo Jung performed a cover of Cho Yong Pil's "Let's Go On A Vacation" in matching sky blue and white couple outfits.�The two singers even came up with a choreography but had some trouble keeping up in time with each other. Kyuhyun and Kim Min Jong performed The Blue's "Together With You".�The two whipped out sunglasses mid-performance and incorporated Super Junior's "Sorry Sorry" dance moves into their stage.�The two said, "We didn't have much time to perform and came up with the dance only today." Hyorin and Hyun Woo covered J.Y. Park's "Don't Leave Me".�While Hyorin hit the high notes, singer-turned-actor Hyun Woo impressed the audience with his low-toned voice.�When Hyun Woo forgot the lyrics mid-performance, Hyorin clarified, "We didn't have enough time to practice.�I had to leave mid-practice so Hyun Woo had to practice on his own as well." Jay Park, Jang Hyuk, Kim Soo Ro, and Solbi amped up the audience with their cover of Jinusean's "Tell Me", while Jiyoon and Gong Hyun Jin continued the trend by singing Lee Moon Se's "Living In This World". Huh Gak and Lee Si Young performed a cute dance to Two Two's "1 and 1/2". Check out the performances below! -- < G.O. & Jo Yeo Jung - "Let's Go On A Vacation" > - < Huh Gak & Lee Si Young - "1 and 1/2" > - < Jiyoon & Gong Hyun Jin - "Living In This World" > - < Kyuhyun & Kim Min Jong - "Together With You" > - < Hyorin & Hyun Woo - "Don't Leave Me" > - < Jay Park, Jang Hyuk, Kim Soo Ro & Solbi - "Tell Me" > - Announcement of winner. - [gallery] Source + Photos: Asia Today via Nate Tip: Dalshidiva