[Verse 1]
[Liam]
You're insecure,
Don't know what for,
You're turning heads when bạn walk through the door,
Don't need make-up,
To cover up,
Being the way that bạn are is enough,

[Bridge]
[Harry]
Everyone else in the room can see it,
Everyone else but you,

[Chorus]
[All]
Baby bạn light up my world like nobody else,
The way that bạn flip your hair gets me overwhelmed,
But when bạn smile at the ground it ain't hard to tell,
bạn don't know,
Oh oh,
bạn don't know you're beautiful,
If only bạn saw what I can see,
You'll understand why I want bạn so desperately,
Right now I'm looking at bạn and I can't believe,
bạn don't know,
Oh oh,
bạn don't know you're beautiful,
Oh oh,
That's what makes bạn beautiful

[Verse 2]
[Zayn]
So c-come on,
bạn got it wrong,
To prove I'm right,
I put it in a song,
I don't know why,
You're being shy,
And turn away when I look into your eye eye eyes,

[Bridge]
[Harry]
Everyone else in the room can see it,
Everyone else but you,

[Chorus]
[All]
Baby bạn light up my world like nobody else,
The way that bạn flip your hair gets me overwhelmed,
But when bạn smile at the ground it ain't hard to tell,
bạn don't know,
Oh oh,
bạn don't know you're beautiful,
If only bạn saw what I can see,
You'll understand why I want bạn so desperately,
Right now I'm looking at bạn and I can't believe,
bạn don't know,
Oh oh,
bạn don't know you're beautiful,
Oh oh,
That's what makes bạn beautiful

Na Na Na Na Na Na Na Na Na Na
Na Na Na Na Na Na [x2]

[Middle 8]
[Harry]
Baby bạn light up my world like nobody else,
The way that bạn flip your hair gets me overwhelmed,
But when bạn smile at the ground it ain't hard to tell,

[All]
bạn don't know,
Oh oh,
bạn don't know you're beautiful,

[Chorus]
[All]
Baby bạn light up my world like nobody else,
The way that bạn flip your hair gets me overwhelmed,
But when bạn smile at the ground it ain't hard to tell,
bạn don't know,
Oh oh,
bạn don't know you're beautiful ([Harry:] Oh),
If only bạn saw what I can see,
You'll understand why I want bạn so desperately ([Harry] desperately),
Right now I'm looking at bạn and I can't believe,
bạn don't know,
Oh oh,
bạn don't know you're beautiful,
Oh oh,
bạn don't know you're beautiful ([Harry] beautiful),
Oh oh,

[Harry]
That's what makes bạn beautiful

[From: link