Fergie swigged bottles of wine while recording THE E.N.D. - so she could show fans what it's like to party with the Black Eyed Peas.
The band's fifth studio album features the party-themed track Out Of My Head, which opens with Fergie slurring, "I'm so tipsy."
And pop star Fergie was determined to stay true to the lyrics, forcing her bandmates to guzzle booze with her in the studio.
She explains, "This song reminds me of the fun character of (Black Eyed Peas' 2005 song) My Humps. I told Will we have to get some wine if I'm going to do this correctly. I'm not going to front on this song. So we all got a little tipsy."