Usher broke down in tears at allegations he was a bad father in an Atlanta court yesterday.
The 33-year-old singer was accused of excessive partying by his ex-wife Tameka Foster's attorney, who showed pictures of him out at clubs while in Europe recently.
The attorney also asked him whether he took drugs to try to prove he was not a fit parent to stop him from getting further time with his children, Usher Raymond V, four and Naviyd Ely, three.
According to TMZ.com, Usher admitted to smoking marijuana but said he had not done so in front of the children.
The personal attack came just hours after the 'Without You' singer claimed Tameka spat on his current girlfriend during a row.
Usher alleged his former spouse walked to his car and said: "I'm gonna kick your ass. Bitch get out of the car. How dare you bring this woman into my subdivision in my house?
"She continued to spit. At this point she pulled the door open, tried to swing at her."
Usher and Tameka filed for divorce in June 2009 after almost two years of marriage. She later filed court documents in Georgia asking the singer to be stripped of joint physical custody of their sons.
The trial continues today.