Justin Bieber: "Only one of the greatest nights of my life '

Justin Bieber was shaking with nerves as he began leading his first tour on Wednesday - until his mentor Usher jumped on stage to support him.

The 16-year-old admitted it was "very nervous" ahead of his first concert in My World in Hartford, Connecticut, his followers on Twitter.com about your anxiety. In a series of posts he wrote, "first tour. Little nervous. Do not want to let u (sic) by the guys ... (support act), Kingston Be on stage is now! Hartford's crazy ... it is almost time. Wow. "

However, Canada achieved a sense of calm before the series - and was given an extra boost R & B Superstar Usher appeared while I was singing her hit Baby.

After the show, Bieber tweeted: "2nite (sic) was ... well ... I was afraid. I did not want to disappoint anyone, but the energy and the fans were incredible. No I can be expected to do this again! My older brother came out to support Usher and even rushed the stage and I was surprised at BABY. (Now) on the bus to Trenton for the next edition ... trying to understand everything from 2nite (sic). Only one of the best nights of my life. "