(Cover) - EN Showbiz - Usher was moved to tears while questioned by his ex-wife Tameka Foster's lawyer in family court Monday.

The singer is currently embroiled in a bitter custody dispute with his former spouse over their two children Usher Raymond V, four, and Naviyd Ely, three.

TMZ reports that Tameka's attorney grilled Usher for hours on the stand, accusing the singer of excessive partying.

Tameka's counsel pulled out photos taken of the star while he was having a night on the town in Europe in February, asking whether Usher imbibed illicit drugs while with his children. Usher admitted that he smoked marijuana, but insisted that he never used narcotics in front of his little ones.

In Late November Tameka filed court papers asking the Without You singer to lose joint physical custody of their children.

Usher is fighting to retain and increase his parental rights, as he desires to spend more time with his tots.

The trial continues on Tuesday. (C) Cover Media