Fans helped Katy's "Dark Horse" video beat Taylor Swift "Shake it Off" in round 1 and then 5 Seconds of Summer's "She Looks So Perfect" in round 2. In round 3 she's up against Ariana Grande's "Problem" with Iggy Azalea!

Juicy J fans have definitely helped Katy's "Dark Horse" win in rounds 1 and 2.

First Nicki's "Anaconda" video edged out Iggy Azalea's "Fancy" with Charli XCX, then in round 2 it stormed past A Great Big World and Christina Aguilera's "Say Something" video. In round 3 Nicki's up against Zedd and Hayley Williams' "Stay The Night' video.

Paramore and Hayley Williams fans are (not surprisingly) showing up in droves for their pop-punk queen. Though Paramore's "Ain't it Fun" lost (not by much) to 5 Seconds of Summer's "She Looks So Perfect" in round 1, their votes were so crazy they're back as a wildcard in round 3, up against another wildcard, A Great Big World and Xtina's "Say Something" video. Hayley fans helped keep her and Zedd's "Stay the Night" video in Top 40 this whole time, too!

A Great Big World's fans showed up early to help their video for "Say Something" with Xtina beat out Sia's "Chandeliers" in round 1. They couldn't fight off Nicki's "Anaconda" in round 2, but they put up such a good fight that their vote totals made them a wildcard, back in round 3, up against Paramore's "Ain't It Fun" video.

Christina's cosign (and guest vocals) helped A Great Big World break into the music scene with "Say Something," and her devoted fans most definitely helped in beating Sia's "Chandelier" in round 1 and garner enough votes in round 2 to come back as a wildcard, despite losing to Nicki Minaj "Anaconda."

You already know 5SOS fans are crazy-dedicated so it's no surprise they really showed up in round 1 to help the boys' "She Looks So Perfect" take down pop-punk staple Paramore's "Ain't it Fun." They couldn't take Katy Perry's fans in round 2, but their votes were enough in round 1 to bring them back as a wildcard in round 3, up against Charli XCX's "Boom Clap" video.

Nicki and Ariana fans are putting in double time, as they're helping Jessie J fans keep the trio's "Bang Bang" going. Pitbull beat "Bang Bang" in round 1, but the girl-power anthem had so many votes, it came back in round 3 as a wildcard, and is now up against Pharrell's "Happy" video.

This year's breakout star doesn't just have a huge hit song, she already has a huge following. First, Meghan's fans helped her "All About That Bass" video beat out Ariana Grande's "Problem" video with Iggy Azalea, then in round 2 she stormed past OneRepublic's "Counting Stars" video. In round 3 "Bass" is up against Jason Derulo's "Talk Dirty" video with 2 Chainz.

Ariana's fans are not to be messed with. Her "Problem" video with Iggy Azalea may have (somewhat surprisingly) lost round 1 to Meghan Trainor's massively popular "All About That Bass" video, but her votes were so high she guearanteed a wildcard spot. Back again in round 3, she's up against Katy Perry's "Dark Horse" video with Juicy J.

Iggy's epic 'Clueless' tribute video, "Fancy" with Charli XCX may have been knocked out in round 1 by Nicki Minaj's "Anaconda" video, but her fans were smart and helped Ariana's "Problem" video (featuring Azalea) garner enough votes to come back as a wildcard in round 3.

MKTO's fans showed up and helped take the duo's "Classic" video past Nico & Vinz's "Am I Wrong" video in round 1, and then helped take down Enrique Iglesias' "Bailando" video with Sean Paul in round 2. They're still going strong in round 3, up against Pitbull and Kesha's "Timber" video.

Pitbull and Kesha's fierce fans teamed up and took out Jessie J, Ariana and Nicki's "Bang Bang" video to make sure "Timber" was on top. As if that wasn't impressive enough, Pit and Kesha fans then helped the video beat Eminem and Rihanna's "The Monster" video in round 2! Now in round 3, "Timber" is up against MKTO's hit "Classic" video.

Kesha's loyal fans were crucial in helping Pitbull's "Timber" video push past Jessie J, Ariana and Nicki's "Bang Bang" in round 1 and then Eminem and Rihanna's "The Monster" in round 2. Keep voting in round 3!

1D's "Story of My Life" video may have lost round 1 to OneRepublic's "Counting Stars" but the dedicated Directioners ensured the boys' had more than enough votes to come back as a wildcard in round 3, now up against fellow Brit Sam Smith's "Stay With Me" video.

Zedd and Hayley Williams fans teamed up and helped take their hit "Stay the Night" video past Ellie Goulding's "Burn" video in round 1, and then gave Calvin Harris' "Summer" video a run for its money in round 2. Now in round 3, "Stay the Night" is up against Nicki Minaj's controversial "Anaconda" video.

Sam Smith's loyal fans helped the soulful singer's "Stay With Me" video beat out John Legend's "All of Me" video in round 1, and then made sure Smith took out Kid Ink and Chris Brown's "Show Me" video in round 2. Now in round 3, "Stay With Me" is in a battle of the Brits with One Direction's "Story of My Life" video.

Jason Derulo's fierce fans helped the R&B singer's "Talk Dirty" video with 2 Chainz beat DJ Snake and Lil Jon's "Turn Down For What" video in round 1, and then fought off Chris Brown's "Loyal" video with Lil Wayne and Tyga in round 2. In round 3 Derulo's "Talk Dirty" is up against Meghan Trainor's "All About That Bass" video.

2 Chainz's fantastic fans showed up to help push Jason Derulo's "Talk Dirty" video featuring the rapper from round 1 through round 2, and now into round 3.

Pharrell's fans must be 'happy' to see their efforts pay off. The "Happy" video fought off Disclosure and Sam Smith's "Latch" video in round 2, and then defeated Maroon 5's "Maps" in round 2. Now in round 3, "Happy" is up against Jessie J, Ariana and Nicki's "Bang Bang" video.

Charli XCX was also in Iggy Azalea's "Fancy" video in Top 40, but Charli fans focused their attention on making sure her solo "Boom Clap" video pushed past Lorde's "Team" video in round 1, and then claimed a victory against Bastille's "Pompeii" video in round 2! In round 3 "Boom Clap" takes on 5 Seconds of Summer's "She Looks So Perfect" video.