Valérie Trierweiler branded 'the President's mistress' by Right-wing MP The 47-year-old divorcee has been under perpetual attack in the French media since her Socialist boyfriend, François Hollande, was elected president in May. She has been accused of everything from inappropriate political intervention via a tweet to publicly feuding with Mr Hollande's ex-partner and mother of his four children, as well as inappropriately wishing to keep her press card while attacking journalists for invasion of privacy. Last month, her employer at Paris Match was quoted as saying she had caused "nothing but trouble" at the magazine in a new book. Arnaud Lagardère was said to view Miss Trierweiler like "an unpinned grenade." He responded to a question on whether having a first lady on his books was a plus with: "Are you kidding?" But in this case, commentators rallied to the first lady and slammed Mr Debré's diatribe, with Le Parisien calling it "virulent and misogynist." Gossip magazine Gala said Mrs Trierweiler had not overstepped the mark to hold a "slightly provocative" position on gay marriage and while Mr Debré was entitled as an opposition figure to criticise her, "he didn't have to lack courtesy." Miss Trierweiler has kept a low profile of late, but this week waded into a heated political debate by declaring she would be a witness at one of France's very first gay weddings after a law legalising same-sex marriage and adoption is passed early next year. "I'm delighted to be one of the very first witnesses at one of the very first marriages for all," she told RTL radio. Mr Hollande will also be a witness at another gay wedding shortly afterwards, the radio said. Commentators said the discreet announcement was part of a well-timed Elysée PR plan to show Mr Hollande is fully behind gay marriage, after he controversially told French mayors he would leave it to their "conscience" to choose to officiate over such ceremonies or pass that responsibility to their deputies. He later backtracked. The French are largely in favour of gay marriage, but a vocal minority - mainly from the Catholic Right - has staged mass demonstrations against the new legislation, expected to pass late January Last month, Paris Archbishop Andre Vingt-Trois said the bill undermined a child's basic right "to know one's parents and be raised by them." Jean-François Copé, acting head of the Right-wing UMP party has called for mass demonstrations against the law on January 13 Socialist MP David Assouline has in turn called on those in favour of gay marriage and medically assisted procreation to demonstrate "massively" on December 16.