Bieber-mania was out in full force Friday morning (June 3), as Justin Bieber fans came out in droves to see the teen star perform on NBC's "Today" show, followed by news that he will add a second leg to his "My World" tour. 

Video: Justin Bieber peforms "Somebody to Love" on "Today"

Bieber performed three songs on "Today": his "My World 2.0" lead single "Baby," current single "Somebody to Love," and his "Karate Kid" soundtrack cut "Never Say Never." Fans reportedly started camping out in New York's Rockefeller Plaza as early as Thursday evening to see the 16-year-old up close. 

Justin Bieber: The Billboard Cover Story

Photos: Justin Bieber Gives You the Fingers

"It's pretty crazy that now I go out and I'm always asked for autographs and stuff, but it's kind of what I signed up for," Bieber told "Today" co-host Matt Lauer in a pre-performance interview. Asked where he sees himself in five years, Bieber said, "I want to be an artist that doesn't just come out with one song and they're done. "I want to be able to, you know, like you said, have longevity -- have my fans grow with me and not just be a teen artist but kind of move up and be an adult artist." 

Video: Justin Bieber talks to Matt Lauer on "Today"

Bieber also added a second leg to his "My World" tour on Friday. Over 30 dates have been added to the North American trek, starting off with Sept. 5 in Timonium, Md., and the singer will be on the road all the way through Dec. 23. The first leg of Bieber's "My World" tour kicks off June 23 in Hartford, Conn.

"My World 2.0" has sold 1,155,000 copies to date, according to Nielsen SoundScan. "My World" has sold 1,370,000.  

Here are Justin Bieber's new tour dates: 

Sept. 5: Timonium, Md. (Maryland State Fair)

Sept. 14: Winnipeg, Manitoba (MTS Centre)

Sept. 16: Regina, Saskatchewan (Brandt Centre) 

Sept. 17: Saskatoon, Saskatchewan (Credit Union Centre)

Sept. 19: Edmonton, Alberta (Rexall Place) 

Sept. 20: Calgary, Alberta (Pengrowth Saddledome)

Oct. 19: Vancouver, B.C. (General Motors Place)

Oct. 22: Sacramento, Calif. (ARCO Arena) 

Oct. 25: Los Angeles, Calif. (STAPLES Center)

Oct. 27: Anaheim, Calif. (Honda Center)

Oct. 28: San Jose, Calif. (HP Pavilion at San Jose)

Oct. 30: San Diego, Calif. (San Diego Sports Arena)

Nov. 3: Oklahoma city, Okla. (Ford Center)

Nov. 5: San Antonio, Texas (AT&T Center)

Nov. 6: Houston, Texas (Toyota Center)

Nov. 8: St. Louis, Mo. (Scottrade Center)

Nov. 10: Louisville, Ky. (KFC Yum! Center)

Nov. 11: Cleveland, Ohio (Wolstein Center)

Nov. 13: Norfolk, Va. (Scope Arena) 

Nov. 14: Philadelphia, Pa. (Wachovia Center)

Nov. 16: Boston, Ma. (TD Banknorth Garden) 

Nov. 17: East Rutherford, N.J. (IZOD Center) 

Nov. 20: Atlantic City, N.J. (Boardwalk Hall)

Nov. 22: Montreal, Quebec (Bell Centre) 

Nov. 23: Toronto, Ontario (Air Canada Centre)

Dec. 13: Pittsburgh, Pa. (Consol Energy Center)

Dec. 15: Greensboro, N.C. (Greensboro Coliseum) 

Dec. 16: Greenville, S.C. (BI-LO Center)

Dec. 18: Miami, Fla. (American Airlines Arena) 

Dec. 19: Tampa, Fla. (St. Pete Times Forum) 

Dec. 21: Birmingham, Al. (BJCC Arena) 

Dec. 23: Atlanta, Ga. (Philips Arena)