Taylor Swift is allegedly upset by people's reaction to her Grammys mix up.

The 24-year-old singer appeared to believe she'd won the award for Album of the Year for her record Red, before realising she'd lost out to Daft Punk.

Cameras caught Taylor making a surprised, elated face when the winner was announced at Sunday night's ceremony, then quickly applauding when it was Daft Punk's Random Access Memories that clinched it.

"Taylor can take the good, but really can't take the bad. She wants to be centre of attention during award shows, that's why she dances all the time. She knows the cameras will be on her," a source revealed to hollywoodlife.com.

"But with what happened, she was genuinely surprised. And afterwards when everyone gave her flack for it, she got upset."

The singer didn't let it affect the rest of her evening though, and she was spotted enjoying herself at the awards ceremony dancing to Kendrick Lamar's M.A.A.D City performance.

She took to the stage to perform All Too Well, adding head-banging dance moves to the piano ballad. Famous faces quickly flocked to tell the star how great she was on Twitter.

"Her performance was vulnerable, skilled and sparkling. That final look to the audience #thatsmygirl (sic)," posted Lena Dunham.

"Best performance of the night so far!!!! Taylor Boss Swift!!!!!!! #GRAMMYs (sic)," confirmed Perez Hilton.

But rapper Wiz Khalifa disagreed and admits he almost nodded off during the performance.

"I love Taylor, but I'm not even gonna lie. I fell asleep, like just a little bit," Wiz told Joan Rivers on E!'s show Fashion Police.