"So, I hate this guy because he always looks like he's 18," he says jokingly. "I hate this guy because he's got more talent in his pinky than [I do in] my whole body, I hate this guy because my wife's in love with him, but I love this kid. He's a kid named Justin Timberlake!"
Cue uproarious applause from the audience! "So here's the deal," Garth goes on. "You're going to sing, 'Happy Birthday, Justin...' Then I want everybody to film it and just flood his Twitter with it."
The fans obliged, and Justin had countless videos of fans singing "Happy birthday" to him on social media. Garth's video concludes with him turning the camera on himself, wishing Justin a happy 35th once again and exclaiming, "We love you, bro!"
The B-Day boy was humbled, clearly. He tweeted a link to Garth's video, writing, "Dude!!!! Stop it! This is THE COOLEST THING EVER! Thanks, Mr. Brooks and B-More!!!"
He also tweeted an "I love you!" at Ellen DeGeneres, who sweetly wished a happy birthday to her "brilliant and adorable friend, @jtimberlake." And then, being a proper gentleman with good Southern manners, Justin expressed his gratitude for all the sweet messages. "Thank you EVERYONE for the bday wishes yesterday!" he tweeted. "Gonna be a fun year... Love you guys!"
Oh, J.T., the feeling is mutual.