While it’s not exactly my favorite music, Lady Gaga hit a huge iTunes milestone on Friday — the fastest selling single of all time.

[ad#Google Adsense 300×250 in story]”Born This Way” is the first single and title track from Lady Gaga’s upcoming album. The track sold 1 million copies since being released just five days ago.

The song isn’t doing good just in the U.S. It hit No. 1 in 23 countries since its release.

If you watched the Grammy Awards, you probably heard the song. Lady Gaga performed the song during the awards where she won three Grammys.

The full album, Born This Way, is expected to be released on May 23,2011.