That's true for at least four of the No. 1 songs from the past 12 months, and we want you to meet the man behind the pen.

Jelly has also said he's always struggled with weight, and that he spent years gaining and losing pounds. It's more than likely that Bunnie has been at his side through a number of different weights, ...

Bunnie Xo reacted to Jelly's dramatic weight loss in a light-hearted new social media video. Continue reading… ...