Photo: WENN
Tulisa recorded 'Scream & Shout' first, and is upset that the track was then given to Britney by Will.i.am.
The singer co-wrote the original version, which was called 'I Don't Give A F**k', with record producer Jean Baptiste for her own album The Female Boss.
But when Will.i.am heard it, he took the track and re-recorded Tulisa's parts with Britney, hence the bad British accent that Britney tries to imitate.
A source told The Sun, "The song was due to be Tulisa's third single from her album until Will told his protégé Jean that he wanted the beat for him and Britney.
"Tulisa's team thought it was a surefire hit but, after losing the battle for the rights, they were forced to release 'Sight Of You' which only got to No 18. She now has to watch on as the song goes Top 5 around the world.
"At one point Tulisa was even considering releasing her version to rival 'Scream & Shout', but now it's unlikely to see the light of day unless it gets leaked."
Watch 'Scream & Shout' below
The track was originally called 'I Don't Give A F**k'.
Will.i.am and Britney have both previously tweeted about the track. Will.i.am wrote, "Wow!!! I feel so excited and full of energy right now!!! I want to #screamANDshout....thank you all...the full video will be on vevo shortly,"
And Britney sent her thanks to Will.i.am, tweeting: "Thank u @iamwill for being such an inspiration & dream to work with. Tonight is a big moment 4 us & the AMAZING fans :) #ScreamAndShoutVideo."
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