Kanye West asked Lana Del Rey to perform for his baby mama, Kim Kardashian, at the over the top marriage proposal in San Francisco earlier this month, but the New York singer politely turned down the offer, Breaking Celebrity News is exclusively reporting.

Kardashian is apparently a huge fan of Lana's and is obsessed with her song "Young & Beautiful" from The Great Gatsby soundtrack.

Yeezus "asked Lana to perform for Kim at surprise marriage proposal in San Francisco,” a source told Breaking Celebrity News exclusively.

“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," the source said.

The rapper rented out AT&T Park in San Francisco on Kim’s 33^rd birthday, and invited most of her family and friends to the ballpark, where he got down on one knee and pulled out THE RING.