Justin Bieber's Revenge on Kevin Kristopik

TEEN pop star Justin Bieber posted a Detroit teenager's phone number to his 4.5 million followers on Twitter in an act of revenge, Gawker reported Sunday.

The tweet, which Bieber posted around midnight Saturday, read, "Everyone call me 248-XXX-XXXX :) or text." The phone number was not Bieber's but the cell phone of Detroit-area teenager Kevin Kristopik.

Bieber was reportedly angry at