Talk about a jaw-dropping moment. Justin Bieber, who was not scheduled to appear at the 2011 MTV Movie Awards, dropped in unexpectedly to claim his Golden Popcorn in the Best Jaw Dropping Moment category for his 3-D concert spectacular "Never Say Never."

"It feels great. I'm so blessed," Bieber told MTV News backstage. "I'm so glad to be back here and to have so many great fans. It's a great night."

"Never Say Never" was a career-defining moment for Bieber and he's fully aware of that fact. "It was great. It was my first time performing at Madison Square Garden and just being there and having that experience, I'm glad that I got to just have that experience. It was great."

After opening the envelope to reveal Bieber had bested his fellow nominees (which included did-that-just-happen scenes from "127 Hours," "Black Swan," "Inception" and "Jackass 3D"), "30 Minutes or Less" co-stars Danny McBride, Nick Swardson and Aziz Ansari were about to be in for an even bigger surprise than the upset victory itself.

Ansari -- who dressed up as Jaden Smith from "The Karate Kid," only to discover Will Smith's son wouldn't be attending -- cried after revealing Bieber's name, "He's not here! He's not here!" The "Parks and Recreation" star then joked that the singing sensation wouldn't be able to accept his first MTV Movie Award because, "He's too busy burning a huge pile of cash in a private jet while he's Skyping with Jaden Smith and Selena Gomez!"

But apparently Bieber wasn't too busy, as the 17-year-old (whose girlfriend, Selena Gomez, was in the audience) suddenly appeared from offstage wearing a "Miami Vice"-like outfit that included a blue blazer, white pants and sunglasses, causing the audience to erupt in the kind of screams that seem to follow him everywhere. After greeting the presenters, Bieber, who stood in the swirling stage fog, took to the microphone and told the crowd, "Thank you so much," explaining that he showed up to the MTV Movie Awards because, "I couldn't let down my fans."

Bieber went on to thank "Never Say Never" director Jon Chu, as well as his manager Scooter Braun, his family and, once again, his ever-supportive fans. "I love you!" he yelled before making a peace sign, which he signed off with a kiss.

MTV News has all of the highlights from the 2011 MTV Movie Awards. Relive the best moments, watch red-carpet interviews with your favorite stars and read all about what went on behind the scenes on the big night.