France's first lady Valerie Trierweiler has admitted she made "a mistake" sending tweets aimed against President Francois Hollande's former partner, reports the BBC.
Ms Trierweiler caused controversy when she used Twitter to publicly back an opponent of Segolene Royal in parliamentary elections in June.
Ms Royal, the Socialist presidential candidate in 2007, is the mother of Mr Hollande's four children.
Ms Trierweiler told a French newspaper she regretted the move.
"It was a mistake that I regret. I must have been clumsy because this was badly interpreted," Ms Trierweiler told regional newspaper Ouest-France. "I had not yet realised that I was no longer a simple citizen. It won't happen again."
During the elections, she tweeted support for Ms Royal's opponent, dissident socialist politician Olivier Falorni. Her actions embarrassed Mr Hollande, who had only recently been elected president.
Read more of this report from the BBC.