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 Stratford, Ont.-raised Bieber's video on the Google Inc.-owned website.   

Bieber tweeted a thank you to "Beliebers" and said the video's success was "crazy."

The singer wrote: "I started on YouTube so ... WOW!"

He was discovered by Atlanta-based manager Scooter Braun via YouTube and Braun introduced him to Usher, who gave him his first record deal.

Lady Gaga's video overtook Bieber's 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.