CALVIN HARRIS LOOKS "MISERABLE" DURING DJING GIG DAYS AFTER BREAKUP WITH TAYLOR SWIFT

When their breakup shocked fans earlier this week, Taylor Swift and Calvin Harristook to Twitter to dispel any rumors of an unfriendly ending. But now, just days after the two ended their relationship, Calvin is back at work and according to some onlookers, not too happy.

While performing at the OMNIA Nightclub in Las Vegas on Friday, June 3, the world-famous DJ "looked miserable and was extremely focused on his music" and "was not into interacting with the crowd," an onlooker tells Life & Style.

Calvin Harris performing at Z100's Jingle Ball in 2015. 

The 32-year-old and his 26-year-old musician girlfriend called things off after 15 months of dating, but assured fans that the breakup is a friendly one.