The 'Summertime Sadness' hitmaker hit back at rumours she was paid up to $2.8 million to perform three tracks at the couple's lavish party at the Palace of Versailles near Paris last Friday (23.05.14) on the eve of their wedding in Florence, Italy.
The 27-year-old singer told gossip website TMZ.com: ''I would never let a friend pay me to sing at a wedding, that would be crazy.''
Asked how much she would charge to sing at a normal wedding, she said: ''I'll do it for free like I did this one!''
The couple asked the star to entertain their guests after Kanye, 36, hired an orchestra to perform her hit 'Young and Beautiful' when he proposed to the 'Keeping Up with the Kardashians' star at AT&T Park in San Francisco on her 33rd birthday last October.
Sources previously claimed that Lana had ''politely declined'' his request to sing the track, which is one of Kim's favourites.
An insider said at the time: ''(Kanye) asked Lana to perform for Kim at surprise marriage proposal in San Francisco.
''Lana politely declined, and didn't give any reason for not being able to perform. It was a very firm no from Lana and her camp. Kanye did try to push it, but didn't get anywhere. Kanye decided to hire an orchestra to perform the song for Kim, and he was much happier with how it turned out.
''Kim was bummed that Lana didn't perform for the big event, but she is still a huge fan. She just loved that Kanye tried to make it happen. Kim is jokingly saying Lana will want to perform at their wedding.''
The couple also hired Andrea Bocelli to sing at their wedding ceremony and John Legend performed at their reception on Saturday (24.05.14).
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