The answer, according to this fun clip exclusive to E! News, is you get the entire celeb cast of The Voice together for one big tribute video.
Adam Levine turns 38 years old on Saturday, March 18, so his coworkers and costars got together to wish him a big Happy Birthday. Levine is constantly surrounded by the biggest stars in music and is one of those stars himself, but still, it's (probably) not every year that Céline Dion sings just for him.
Of course, not all the wishes are totally kind. Alicia Keys refers to Adam as her "ancient" big brother, and Adam's BFF/frenemy Blake Shelton is joined by season 12 mentor Luke Bryan to remark that he didn't think his friend would live this long. He also declares Bryan "the country version" of Adam Levine, which could either be a great compliment or a terrible insult coming from Shelton.
