Justin Bieber video tops YouTube

San Francisco - Pop star Justin Bieber's music video Baby has crossed 500 million views on YouTube and is the most watched ever on the video-sharing service that launched the boy music idol to fame.

The video, whose full title is Justin Bieber - Baby ft. Ludacris, had logged 500.4 million views on Monday.

The video had also scored a whopping 1.1 million "dislikes" as compared to 578 000 "likes" from viewers expressing their opinion with simple thumbs-up or thumbs-down rankings at YouTube.

Bieber's clip topped a Bad Romance music video by Lady Gaga that had been viewed nearly 362 million times.

The top amateur video of all time at YouTube was Charlie bit my finger - again, a 56-second snippet of a baby chomping on his bigger brother's forefinger.

The video had been viewed more than 296 million times, with 600 000 "likes", as of Monday.