Last month Justin Bieber announced his new single "What Do You Mean?" will release on Aug. 28 while appearing on Ryan Seacrest's radio show.

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While speaking with Seacrest, Bieber dished that the new single is about how complicated girls are.

"Well, girls are often just flip-floppy," the Canadian singer revealed, explaining, "They say something and they mean something else. So ... what do you mean? I don't really know, that's why I'm asking."

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Since making the announcement, Bieber's array of celebrity pals have helped countdown to the big reveal.

Seacrest actually kicked off the countdown on the "30 days" mark.

The radio personality held up a sign in a photo that included Bieber's name, his single's name and the number of days until it releases.

A bunch of other pals of Bieber's have partaken in this exciting countdown, including Mariah Carey and Kylie Jenner.

The latest celebrity friends of Bieber's to rally behind the upcoming release of "What Do You Mean?" are the British ladies of Little Mix, Madison Beer, Ed Sheeran and Fifth Harmony.

Sheeran and the 5H girls did something a little more special than just holding up signs like Carey and others have. They sang a little bit.

Bonus points to Sheeran for breaking out his guitar for the occasion!

Which celebrities do you think will be tapped next for the countdown festivities?