On November 29th, 4minute's HyunA and B2ST's Hyunseung shocked their fans with a racy stage at the '2011 MAMA' in Singapore -- a stage that included a long, steamy kiss. HyunA and Hyunseung brought out a risque performance to introduce their new project duo, 'Trouble Maker' first and exclusively at the 2011 MAMA. Dressed up in evening gowns and suits, the two danced provocatively against a moon-lit background. Fans went wild over their very intimate choreography, which had Hyunseung touching HyunA's legs, HyunA jumping onto Hyunseung and wrapping her legs around his waist, and finishing off with a passionate embrace. Check out the performance for yourself down below! Source: Newsen