Susan Boyle's album became the best-selling debut in UK chart history

Britain's Got Talent runner-up Susan Boyle was the star of the most popular video of 2009 on video site YouTube.

The Scottish singer's surprising rendition of I Dreamed A Dream on the show has been watched by more than 120 million viewers worldwide.

The moment had more views than the next three most-watched videos combined.

In second place, with more than 37 million views, was a video featuring a disorientated seven-year-old boy recovering from dental work.

David After Dentist was posted by the child's father after his son had surgery to remove a tooth in 2008.

Within a week the video had amassed more than five million views and had become a viral hit.

The video shows the child in the back of the car telling his father that he "feels funny".

"Is this real life?" he asks.

The video has a huge following with fans producing t-shirts and stickers featuring the child star. David's Father, David Davore, has also been asked to speak at events.

Third place went to JK Wedding Entrance Dance, which showed an convoluted dance routine featuring members of their entourage just before their wedding.

It attracted 33 million views and attention from Sony, which owned the rights to the Chris Brow song that provided the soundtrack to the video.

The firm placed a link next to the video allowing people to buy the song and also shared profits from sales of advertisements on the site.