Lady Gaga turned down $1 million to appear at the US Republican conference last year.

The "Bad Romance" singer was offered the huge sum to appear at the event in August 2012, and the party even promised $230,000 of the money would go to domestic violence shelter if she agreed to perform.

Other artists to say no to the event included country star Dolly Parton and rapper Pitbull, although they were offered lower fees.

The discoveries were made in a lawsuit filed by the Republican party's fundraising organization, American Action Network against Cater America LLC, who organized entertainment for the event. Gaga, 27, has previously been critical of Republican presidential candidate Mitt Romney, and showed support for current president Barack Obama, when he was elected ahead of his opponent for the Democrat party in November last year.

Upon hearing the news of his re-election, she tweeted, "I JUST GOT OFF STAGE IN COLUMBIA!! CONGRATULATIONS MR. PRESIDENT @BarackObama We are so proud to be American tonight! YES!!! YES! YES!! (sic)."

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