MBLAQ's Lee Joon cracked up the studio when he decided to test out the strength of his chest muscles during the latest recording of 'Star King'. During this recent recording of 'Star King', fitness star Sean Lee came on the show to share some summer diet tips.�His 'summer diet special' is being featured for 7-8 weeks and this week, he talked about creating chest muscles. To demonstrate that he wasn't just all talk, Sean Lee placed a wine glass on his chest and had grape juice poured into it while he flexed his chest muscles, providing a stable surface for the glass and preventing it from falling over. Lee Joon got jealous of the performance and decided to try out the trick himself. He pulled up his shirt and wowed the ladies in the studio with his hot body. Was he successful at his attempt? The results of this wine glass challenge will air on August 13th! Source: mydaily via Nate