BUFFETT TO KIN:YOU'RE FIRED!

A pissed-off Warren Buffett has renounced one of his granddaughters - telling her she is no longer his relative "legally or emotionally" because she took part in a documentary about the lives of the very rich.

Nicole Buffett, the adopted daughter of Buffett's son Peter and biological daughter of Peter's ex-wife Mary, was featured in Jamie Johnson and Nick Kurzon's documentary, "The One Percent," which debuted at the Tribeca Film Festival this year and is a follow-up to Johnson's "Born Rich."

Pissed that Nicole not only participated in the documentary, but also plugged it on National Public Radio and "Oprah," Buffett wrote Nicole an "angry letter" two weeks ago telling her she was no longer part of his life, a close source says .

Buffett wrote, "I have not emotionally or legally adopted you as a grandchild, nor have the rest of my family adopted you as a niece or a cousin."

"He was angry Nicole was using the Buffett name to promote herself and said he no longer considered her his granddaughter," our source added.

Indeed, asked for comment, a rep for the mega-billionaire said, "Nicole is not Mr. Buffett's granddaughter. She is the daughter of a former daughter-in-law of his who was married to his son for only about 10 years."

This response shocked Nicole's friends. "We have seen pictures of her on his knee when she was 4. She spent family summers with him. She calls him Grandpa and always has. This is amazing," one pal said.

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