India, July 24 -- American singer Justin Timberlake is under fire after a video from his recent performance in Romania began circulating online, with fans calling him out for barely singing during one of his biggest hits.

The 44-year-old, currently on the European leg of his Forget Tomorrow World Tour, performed at the Electric Castle festival in Transylvania last week. But it's his rendition of Can't Stop the Feeling! that has sparked widespread backlash on social media.

In the viral clip, Justin is seen singing the opening lines of the upbeat track as rain begins to fall. He pulls the hood of his jacket over his head and then turns the mic toward the audience, encouraging them to take over. "Say what?" he says, prompting the crowd to ...