Redfoo, 39, suffered a cut above his right eye when a glass was thrown at his head at the Golden Sheaf Hotel in Double Bay early this morning, police say.
The US singer was treated at the scene by paramedics, police say.
A 21-year-old man who allegedly attempted to flee the scene was stopped by security guards and arrested.
He was taken to Waverley Police station where he's been charged with malicious wounding.
He has been granted conditional bail and will appear at Waverley Local Court on September 24.
Redfoo confirmed the glassing via social media by responding to a witness to the attack, who had contacted the star on Twitter.
"Just saw @RedFoo get a bottle thrown at his head at the Golden Sheaf bleeding! Jesus Christ! What is wrong with people .. Hope your'e okay mate," Josh Allerton tweeted.
Redfoo replied: "Jealously is a hell of a drug!".
Redfoo is the youngest son of Motown Records founder Berry Gordy, who signed The Jackson Five in 1968.
