A clip of Britney Spears burping has topped a chart for the most viewed internet viral video of 2006. The TOXIC star was filmed belching and mumbling her thoughts on time travel in the footage, which made it's way onto the internet. Spears' clip has now been viewed by over three million people online according to ViralVideoChart.com, which monitors the web for popular clips spread through blogs, emails and instant messages. Spears' ex Kevin Federline came in second place, with footage supposedly showing him receiving a break-up text message from his estranged beau. Controversial comedian Michael Richards' racial outburst at a Hollywood comedy club last month (NOV06) is third with a million viewings. Spears' new best friends Lindsay Lohan and Paris Hilton scooped fourth and fifth place respectively. Lohan was filmed bad-mouthing Hilton, while the socialite's most popular clip was one showing the star crashing her Bentley.