Takes One to Know One Katy Perry

[Intro]
What are you lookin' at?
(Yeah)

[Verse 1]
I saw this coming from a mile away
I saw a crack in the egg
A little rip in the page
I found your knickers on the floor
Underneath the bed
Where you said
I was the only one

[Pre-Chorus]
You thought I'd cry (You thought I'd cry)
You thought I'd lay down and die
You thought there's no getting over you (Ha-ha)
And all this time (All this time)
You've been having your fun
I've been having some fun too

[Chorus]
'Cause it takes one to know one
Congrats you've met your match
You think I'd lie here, heartbroken
But the knife is in your back (In your back)