You walked in to the classroom like you were just the greatest thing
Your hair it was so slicked back to match your sneer 
Your scarf - it was Slytherin
You had one eye on the Weasleys -- to be sure they saw you, too. 
And no one wanted be your lab partner, to be your lab partner, and 

You're so vain, you probably think these books are about you
You're so vain
I'll be you think these books are about you, don't you, don't you? 

You might've had me several years ago when I was still quite naive
When you said was important to know the "right sort."

That you were who I should believe 
But you said you hated the Muggle-born, and one of them was me
I had some dreams that you wore the Dark Mark, You wore the Dark Mark, and 

You're so vain, you probably think these books are about you
You're so vain
I'll be you think these books are about you, don't you, don't you? 

Well, I hear you like to cheat at Quidditch
And your team, naturally, wins
Then you threw away Neville's rememberall because that's your idea of fun
Well, you're where you should be all the time
And when you're not, you're with one of Voldemort's spies or you're ratting out a close friend, ratting out a close friend, and 

You're so vain, you probably think these books are about you
You're so vain
I'll be you think these books are about you, don't you, don't you?