The singer told The Associated Press this week that he knew "OMG" would have "incredible energy" but adds: "Did I know that my children would love it at 1 and 2? I only hoped."
The thumping dance tune is produced by will.i.am (wil eye am) and is his ninth No. 1 single. It's from his gold-selling album "Raymond v. Raymond."
The 31-year-old is the father of 2-year-old sons Usher Raymond V and 1-year-old Naviyd (nah-VEED') Ely Raymond. He divorced their mother, Tameka Foster, last year.
Usher credits will.i.am for the song's success. He says the Black Eyed Peas leader always "keeps his finger on the pulse of where the world is and what they're listening."
