went from someone I found on YouTube to pop stardom.

Here to perform his huge hit, "How Long," please

welcome three-time Grammy nominee, Charlie Puth.

[APPLAUSE]

[MUSIC - CHARLIE PUTH, "HOW LONG"] Yeah.

CHARLIE PUTH: (SINGING) I'll admit, I was wrong,

what else can I say girl?

Can't you play my head and not my heart?

I was drunk, I was gone, that don't make it right

but I promise there were no feelings involved.

She said, boy tell me honestly, was it real or just for show?

She said, save your apologies.

Baby, I just got to know.

How long has this been going on?

You been creepin' round on me, while you're calling me baby.

How long has this been going on You've been acting so shady.

I've been feeling it lately, baby.

I'll admit it's my fault, but you

got to believe me when I say it only happened once.

I tried, I tried, but you'll never see that.

You're the only one I want to love.

Oh yeah.

She said, boy tell me honestly, was it real or just for show?

She said, save your apologies.

Baby I just got to know.

How long has this been going on?

You been creepin' round on me, while you're calling me baby.

How long has this been going on?

You been acting so shady.

I've been feeling it lately, baby.

How long has it been going on, baby?

Girl tell me now.

She said, boy tell me honestly, was it real or just for show?

She said, save your apologies.

Baby I just got to know.

How long has this been going on?

You been creepin' round on me, while you're calling me baby.

How long has this been going on?

You been acting so shady.

I've been feeling it lately.

Yeah.

How long has this been going on?

You been creepin' round on me.

How long has it been going on, baby?

Tell me now.

I've been feeling it lately, baby.

[APPLAUSE]