Announcer: And now, the band you've been waiting for, Max Modem and the Mainframes!
Lawrence: I think my girlfriend is an alien,
Invading force from Planet 10,
Said she was from out of town,
But I know what she meant...

Lawrence and Phineas: I know she's from another galaxy,
Lawrence: I don't know just what she's a-doing with me!
She treats my love like a science experiment...

Hubble-Bubble

Does she love me for who I am?
Or does she want to put my brain in a can?
She can have it, cause I never want to be apart...
Fan-girl: Take my leg warmers, Max!

Lawrence: From her alien heart!

(She's got an alien) Heart!
(She's got an alien) Heart!
(She's got an alien) She's got an alien heart!
(She's got an alien) Heart!
(She's got an alien) Heart!
(She's got an alien) Heart!

Perry/Doofenshmirtz [bad word] 
She's got an alien heart!
(She's got an alien) Pumps like the [bad word] 

(She's got an alien) She's got an alien heart!
(She's got an alien) Heart...
(She's got an alien) Heart...
(She's got an alien) She's got an alien heart...

We're Max Modem and the Mainframes! Thank you Tri-State Area!