What Did Lady Gaga song written for Britney?

Hello. . . You know what song he wrote for Britney Lady Gaga album Circus. . . I can not know which one?

Eye Said,
She wrote two songs for Britney. I do not know if Circus is one of them, but I know Quicksand (bonus track for Europe) is.

Posted on August 29th, 2009 at 11:47 AM
eduardo rodriguez Said,
Sorry, I do not know, I love the songs of Britney, but I do not know who wrote most of them lol.

Posted on August 29th, 2009 at 12:44 PM
JessMax + Colt and Liam Said,
I'm pretty sure it's circus. . .

Posted on August 29th, 2009 at 1:38 PM
dancer_1 Said,
Is not this circus?

Posted on August 29th, 2009 at 1:45 PM

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