HOLLYWOOD, Calif. — Justin Bieber satisfied his fans on two fronts Tuesday. In addition to releasing his new single, "U Smile," the 16-year-old teen star also announced his first North American headlining tour.

Bieber will kick off his 40-city "My World" Tour on June 23 at the XL Center in Hartford, Conn. The concert trek, which will include special guest Sean Kingston, is scheduled to wrap on Sept. 4 in Allentown, Pa.

Tickets for most of the shows go on sale March 27.

"U Smile" is the second single off Bieber's new album My World 2.0, which drops on March 23.

"Wrote this song for u guys, and now u are all helping it climb the TOP TEN of ITUNES," Bieber wrote Tuesday on Twitter, while promising that more concert dates will be added in the future. "U SMILE is #10 already! thank u so much. Lets go #1!"

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