2PM slayed at a performance for '2PM Is Back With Genie' this week -- and they got a little affectionate, too.

The K-Pop superstars performed for 3,000 fans at Gangnam Station on May 17 to hear the boys perform tracks from their third album, 'Grown,' as well as old favorites. The gentlemen took the M Stage to serenade the crowd with 'I'll Be Back,' 'Heartbeat,' 'Hands Up' and new singles 'Come Back When You Hear This Song' and 'All Day I Think of You.'

But the highlight for fans? Seeing the boys give one another playful hugs, spankings and piggyback rides, which you can watch in the clip above.