Singer Usher says his five-year-old son, Nayvid, is his toughest critic.

"He doesn't care about what I do as much. ... He's like, 'I'm the star. Who are you? You sing?' He told me the other day, he says, 'You're not a great singer',` femalefirst.co.uk quoted the 36-year-old as saying.

But the "She Came To Give It To You" hitmaker has a fan in his elder son, Usher Jr., who is already showing signs of following in his footsteps.

"When seeing me perform on tour in the past...and most of the time it's past his bedtime, but he's just sitting there studying every move, every second, like laser focus. And then I'll see him off by himself doing the moves,` said Usher.

Usher split from the boys's mother, Tameka Foster, in 2009 after two years of marriage and secured primary custody of them following a court battle.