The website of supermodel-turned pop star, who married the French leader after a whirlwind romance last year, was unable to cope with the number of visitors, according to aides.
There was a profile presenting the 41-year-old Italian-born pop star as a modern feminist who admired the Suffragettes and the women's liberation movement.
Its goal was to promote her foundation set up to help Frances "most vulnerable citizens". "Because of too many visits, the site ...carlabrunisarkozy.org is provisionally inaccessible," a message was quoted by the Times online on Thursday.
According to media reports, she sometimes feels locked in a beauty contest with Michelle Obama and other leading ladies.
The pastel colours on the site appeared to suggest that the woman who had affairs with the likes of Mick Jagger and Eric Clapton is now a model housewife, it said.