A Justin Bieber Birthday Card, from Billboard.com
Pamela Littky

Justin Bieber's music video for "Baby" is the most-watched video ever on YouTube.

The 16-year-old pop star's video passed Lady Gaga's "Bad Romance" video to take the all-time lead. More than 246 million have watched Bieber's video on the Google Inc.-owned website.

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Bieber tweeted a thank you to "Beliebers" and said the video's success was "crazy." The singer wrote: "I started on youtube so ... WOW!"

Bieber's video and Lady Gaga's switched positions briefly Friday, but as of late afternoon, Bieber was ahead by more than 600,000 views.

The most-watched clip on YouTube that isn't a music video is the popular "Charlie bit my finger" viral video, which more than 210 million have watched.

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