I don't think they did anything to Britney's vocals at all. Y'all been saying her talking voice keeps getting deeper and I think it translated into the song. I think it's honestly all her.
The song isn't great though. I don't understand how will.i.am could produce so many hits for BEP and Fergie, but absolutely none for himself?
Tha beginning sounds like a LMFAO song,tha electronic lady voice thingy. And then Brit is only in tha song for a total of 40 seconds with liddo 5 second pieces here and there Then it turns into a song that sounds like a dj mix at a club. Britney probably didn't even wanna do this song with him,i know i wouldn't
Oh God this song absolutely terrible Its on the same level as that mess "T.H.E." song with mick jagger and jlo. I don't even consider it a song. Just random phrases