Alex and Sierra are officially unstoppable! The duo's 'Scarecrow' has once again taken the top spot on the Top 10 Video Countdown.

Coming in at No. 2 is Ed Sheeran's 'Don't,' followed by Rilan's 'Chemical' at No. 3.

This week, Taylor Swift's 'Shake It Off' slid to the No. 4 spot, while Iggy Azalea's 'Black Widow' held steady at No. 5. Ariana Grande's 'Break Free' rise to No. 6, followed by Jessie J's 'Bang Bang' (No. 7) and Coldplay's 'True Love' (No. 8).

Rounding out the top ten are Katy Perry's 'This Is How We Do' (No. 9) and Fifth Harmony's 'BO$$' (No. 10).

Vote for your favorites once per hour until the poll closes at 3PM ET on Sept. 25. Don’t forget to tweet with the hashtag #PopCrushTop10 to spread the word about voting for your favorite new video!

If you are on a computer or tablet, the voting poll is the the right of this article. If you are on a phone, you have to scroll down past the Top 10 videos below to access the voting poll.

  • 10

    Fifth Harmony, 'BO$$'

  • 9

    Katy Perry, 'This Is How We Do'

  • 8

    Coldplay, 'True Love'

  • 7

    Jessie J, 'Bang Bang' Feat. Ariana Grande + Nicki Minaj

  • 6

    Ariana Grande, 'Break Free'

  • 5

    Iggy Azalea, 'Black Widow' Feat. Rita Ora

  • 4

    Taylor Swift, 'Shake It Off'

  • 3

    Rilan, 'Chemical'

  • 2

    Ed Sheeran, 'Don't'

  • 1

    Alex & Sierra, 'Scarecrow'