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I know you guys and girls have all been dying to find out who the secret member of the project girl group on SBS's Inkigayo Summer Special was, cause we sure did!

Well, prepare to have your mouth stuck on open, as the mystery member is... MC MONG! Can't say I was expecting that one, although he did serve as SNSD's husband during Hello Baby. Along with SHINee's Key and Taemin and 2PM's Taecyeon and Wooyoung, these boys... girls... uh idols sure rocked the stage!

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Credit: allkpop.com