In the new book, written by Michael Darmon and Yves Derai, France's first lady Carla Bruni claims she asked Obama about being the president's wife during a private discussion earlier this year, according to London's Daily Mail newspaper.
"Don’t ask! It’s hell. I can’t stand it!" Obamareplied, according to Bruni's bombshell account in excerpts obtained by the newspaper.
Obama's spokeswoman, Katie McCormick Lelyveld, said today that the first lady never described her White House life as "hell."
The French Embassy in Washington also released a statement denying that Obama ever said those words. The Embassy said Bruni "distances herself completely" from the book, which is due out Friday.
According to the Daily Mail, the outspoken Bruni, 42, also laces into French government officials, accusing them of trying to "kill" her husband by loading him up with work -- and that Sarkozy lets himself be "bullied" into doing it, the newspaper reported.
Aside from dishing dirt on Obama and her hubby, Bruni also takes a swipe at Princess Diana when discussing a recent visit to an Aids hospital in Africa.
Bruni married Sarkozy in 2008 after the French president divorced his wife.
Their quickfire relationship raised eyebrows in France at the time -- especially given Bruni's assertion in a 2007 magazine interview that she was "crazily bored by monogamy."
Asked about that famous comment in a recent TV interview, Bruni pointed out that Sarkozy was her first husband.
"Well I was never married, so I think monogamy has to do with marriage, right?" she said.
Bruni once described herself as a "man tamer" and has had a number of affairs with intellectuals and rock stars, including Mick Jagger and Eric Clapton, and has a young son from a previous relationship.
In the book, Bruni said she refused requests by French cameramen to snap a photograph of her carrying a baby in her arms "like Lady Di" -- adding that there is "something obscene in promoting yourself when you are giving of yourself."
The book, released to combat an unauthorized biography of Bruni out this week, will hit French store shelves later this year.