Justin Bieber, Victoria Justice at Nickelodeon Upfront today!

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Hey M Girls!

Today, M caught up with stars like Victoria Justice, the guys of Big Time Rush, Miranda Cosgrove, and last but not least, Justin Bieber!! Check out our photos below and clips of JB's LIVE performance of his new hit single, "Baby"!!

Victoria Justice looked extra-pretty when she presented a clip from her upcoming Nickelodeon show, Victorious!

JBiebs looked super-cute as he serenaded the crowd and made M Girls melt!

Check out JB's "Baby" performance below!!

Let's dish: What'd you guys think of Justin's performance? If some of you M Girls were there, us know what you thought of it -- plus, the major highlights and what it was like to see JB sing and dance LIVE!

Keep up with Justin Bieber in the pages of M Magazine by subscribing now!