U.S. singer Britney Spears smiles for photographers during a photo session in Tokyo in this file photo from December 12, 2003.[Reuters]

The public's appetite for those "Oops! ... I Did It Again!" moments involving pop princess Britney Spears shows no sign of waning as she scooped the number one celebrity viral video this year.

A clip of Spears burping and talking incoherently about her belief in time travel was viewed over 3 million times to take top spot comfortably, said ViralVideoChart.com on Monday.

Live TV footage of Spears' estranged husband Kevin Federline apparently getting a text message informing him the pop singer had filed for divorce was second with nearly 2 million hits.

Viral video is the term used to describe clips that gain huge popularity after being posted on the Internet, spreading like viruses through emails, blogs and instant messages.

ViralVideoChart.com says it scans several million blogs a day to see which clips are being talked about most and compiles a daily list of the 20 most-viewed videos.

Seinfeld co-star Michael Richards' racist outburst was third in the 2006 chart with over a million hits just four weeks after it was first posted online.

Richards sparked a public outcry for spewing a torrent of racial slurs at hecklers during his stand-up act at the Laugh Factor comedy club in Hollywood on November 17.

The incident was captured in digital camera video footage that was widely circulated on the Internet and was broadcast on TV newscasts three days later.

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