Justin Timberlake, Alanis Morrissette and Cee Lo Green. (WENN.COM file photos)

So Justin Bieber has pulled an Adele or Taylor Swift -- take your pick -- and finally written a breakup song.

It's about time.

The "are they, aren't they?" together thing with fellow pop star Selena Gomez was getting tired and the tune, Nothing Like Us, finally puts their overwrought love saga to bed once and for all.

Still, the song - from The Biebs new album, Believe Acoustic, which came out this week - is hardly bitter.

It's a gentle piano ballad with the toughest lyric being: "Have you been drinking to take all the pain away?"

For some tips on how to really light into your ex, Bieber should follow the example set by these five songs -- among the best breakup anthems of all time (with apologies to Adele and Swift because you could just list the track listings of their collective albums).