It's finally here! Today is the day when we reflect on all the "Big & Best of 2012" with our massive eight-hour live stream, which kicked off at noon ET, across all digital properties, including MTV.com, VH1.com, CMT.com and ComedyCentral.com, with eight hours of programming and highlights from MTV, VH1, Comedy Central, CMT and MTV2.

It's a day jam-packed with interviews, roundtable discussions, performances and even a fan army competition. We've got you covered with the big and best highlights from MTV. (For the full list, check out BigandBestof2012.com.)

And it kicks off now with "Adorn" singer Miguel bringing the hotness and sexiness to the "Big & Best" stage. But, the fun doesn't end there, with a very special episode of "RapFix Live" taking place, featuring Ma$e and A$AP Rocky, and appearances from MTV's very own Vinny Guadagnino as well as Carly Rae Jepsen (who will count down her favorite moments), "The Walking Dead" star Norman Reedus also making stops throughout the day.

In between all that, every hour we will narrow down the "Last Fans Standing" competition until one artist and fan group is, well, left standing. It's still anyone's game though as all day long, challenges will continue to take place until an artist and his or her fans come out on top.

But the A-list guests don't end there. Before the day comes to a close, Taylor Swift has a very special gift for her fans one day before her 23rd birthday, and Bruno Mars will get personal about his album Unorthodox Jukebox.

Here are some of the highlights from the big show!

12:00 pm - Miguel Live Performance: The crooner and Grammy nominee will perform three tracks off his Grammy-nominated Kaleidoscope Dream to kick off the party.

2:00 pm - "MTV After Hours" With Norman Reedus: MTV News' Josh Horowitz has enlisted "Walking Dead" star Norman Reedus for some "After Hours" inspired shenanigans. Prepare yourselves!

3:30 pm - Vinny Guadagnino: The "Jersey Shore" star will join the program to open up about his next MTV show, "The Show With Vinny."

4:00 pm - "RapFix Live" With Ma$e & A$AP Rocky: The two dollar sign loving rappers will join MTV News' Sway Calloway for a very-special episode of the weekly hip-hop series.

5:00 pm - A$AP Rocky Live Performance: After sitting down with Sway, the MC will bring some hip-hop swag to the show with a can't-miss performance.

7:10 pm - Last Fans Standing Winner Revealed!: When all the challenges are over, only one artist and fanbase can win the honor. Tune in to find out who that winner is!

7:20 pm - Taylor Swift "I Knew You Were Trouble" Video Sneak Peek: One day ahead of the premiere and her 23rd birthday, Swift will tease fans with a sneak peek of her "Trouble" music video, directed by Anthony Mandler and co-starring Reeve Carney.

7:50 pm - "MTV First: Bruno Mars": Mars will sit down with Sway to chat about his just-released new album and perform the track, "Young Girls," closing out the "Big & Best" festivities.

What are you most excited to see during "Big & Best of 2012"? Tell us in the comments!

Stick with MTV as we count down the Best of 2012, including the Best Songs of 2012, Best Albums of 2012, Best Artists of 2012 and Best Movies of the year.