Meghan Trainor And Luke Bryan Tease Justin Bieber's 'What Do You Mean' Single

Page Mackinley

Meghan Trainor and Luke Bryan are the latest famous names to feature in Justin Bieber's celebrity-assisted countdown to the release of the Biebs' upcoming single, "What Do You Mean," which drops Aug. 28.

Last month, Justin announced the single and kicked off the countdown over at On Air With Ryan Seacrest. Since then, a slew of stars have ponied up to help the Canadian keep his single in the public's awareness.

So far, the roll call includes Ruby Rose, James Corden, Mariah Carey, Travis Scott, Ariana Grande, Big Sean, Little Mix, Ed Sheeran, Fifth Harmony, and The Fat Jewish.

Now, at the 15-day mark, Good Morning Britain co-host Richard Arnold, Meghan Trainor, Luke Bryan are doing the honors.

— Good Morning Britain (@GMB) August 13, 2015

— Justin Bieber (@justinbieber) August 13, 2015

The last part refers to Trainor's ongoing issues with her vocal cords, which most recently forced her to pull out of her current U.S. tour.

Country star Luke Bryan got cute in a funny skit, in which he pretends to congratulate the heartthrob on the imminent arrival of his song on Country radio.

— Justin Bieber (@justinbieber) August 13, 2015

The Biebs previously described his upcoming single as "summery" and "poppy but cool." It was recently endorsed by Charlie Puth who tweeted that the song is a wow-worthy hit. As a co-writer on "See You Again," one of the biggest hits of the year, Puth should know.

— Charlie Puth (@charlieputh) August 11, 2015

— billboard (@billboard) August 12, 2015

Amid building buzz for Bieber's next record and new single, Billboard noted "What Do You Mean" is the most mentioned track on Twitter, which saw it top the publication's Trending 140 chart at one point on Thursday.

— billboard (@billboard) August 13, 2015

— Madison Beer (@MadisonElleBeer) August 12, 2015

— Justin Bieber (@justinbieber) August 12, 2015

— Justin Bieber (@justinbieber) August 11, 2015

— Justin Bieber (@justinbieber) August 10, 2015

— Justin Bieber (@justinbieber) August 9, 2015

— HALSEY (@halsey) August 8, 2015

— Justin Bieber (@justinbieber) August 6, 2015

— Justin Bieber (@justinbieber) August 3, 2015

— Justin Bieber (@justinbieber) August 1, 2015