Robin Thicke, Miley Cyrus
Miley Cyrus and Robin Thicke perform "Blurred Lines" during the 2013 MTV Video Music Awards in New York Sunday. Reuters

Robin Thicke took the stage to perform his hit single "Blurred Lines" at the MTV Video Music Awards Sunday night, but not surprisingly his guest performer, Miley Cyrus, stole the spotlight. While the performance has gained media attention nationwide due to Cyrus' scant clothing and suggestive dance moves, the 36-year-old musician is allegedly upset over the incident.

According to a report from Us Weekly, Thicke has already revealed his disappointment over the 90-second collaboration. "Robin thought it would be fun to include Miley," a source told Us Monday, "but he didn't realize how much she would overshadow him."

Allegedly, Thicke is upset over what he felt was a lost opportunity. "Blurred Lines" is the song that spurred his recent rise to fame, so "this was a big night and a big performance," said the source. "I don't think he would have done it knowing what it ended up like." A different source close to the singer tells it differently, claiming Thicke had a "great time" performing the song with the 20-year-old former "Hannah Montana" Disney star.

Cyrus, who also performed her new hit single "We Can't Stop" Sunday, tweeted her thoughts on the event, calling it "the best f--king day ever." But her management team is reportedly feeling the heat. "Miley's team is freaking out about that performance," an inside source revealed to the magazine. "They saw the rehearsals, but those were really played down compared to the live performance."