For two days on December 9 and 10, IU held '2017 IU Tour Concert' at Jamsil Arena in Seoul. The show was filled with stellar performances of the singer's hit tracks and became even more special with the guest appearances of Big Bang's G-Dragon and Psy.

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Meanwhile, in the audience, hot celebrity couple Song Joong Ki and Song Hye Kyo were captured enjoying the event. It's reported Song Hye Kyo was frequently spotted singing along to IU.

Actor Park Bo Gum was also spotted cheering on IU in the audience. 

Co-stars of 'Scarlet Heart: Ryeo' including Lee Jun Ki, Kang Han Na, and more not only watched from the audience but also made visits to IU's waiting room to show support. 

Not pictured, but AOA's Seolhyun, EXID's Junghwa, and more also reportedly attended the event. Check out more photos of the star-studded audience below!