A picture of Psy and Redfoo was taken inside a club.
Psy uploaded a picture on Sunday, of himself with LMFAO's member, Redfoo, on his Twitter.
Redfoo had his arm around Psy's shoulder and Psy was seen with a frowning and strange face.
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Internet users commented, "I can't believe Psy and Redfoo too a picture together. I'm nervous," "Psy became friends with LMFAO? That's awesome," "I like the club picture."