It seems like the "Gangnam Style" fever has hit Justin Bieber as well.

Earlier today, the pop artist tweeted,

heyyyy sexy laaady

� Justin Bieber (@justinbieber) October 17, 2012

Fans responded immediately with the following lyrics to Psy's "Gangnam Style". A few hours later, Psy himself tweeted back at Justin Bieber, writing,

@justinbieber op op op op

� PSY (@psy_oppa) October 17, 2012

The two are both labelmates at Schoolboy Records. Fans are speculating if Justin's sudden tweet could mean a possible collaboration between the two.

Source: Psy's Twitter and Justin Bieber's Twitter
[Thanks to everyone who sent this in!]