French election
France's President Francois Hollande and Trierweiler celebrate on stage during a victory rally at Place de la Bastille in ParisReuters

France's First Lady Valerie Trierweiler has been taken to hospital while her partner, French President Francois Hollande, deals with the fallout from recent allegations of an affair.

Aides to Trierweiler told French newspaper Le Monde that she had been admitted to hospital on Thursday, shortly after the news of the affair broke.

It subsequently emerged that she was in fact hospitalised on Friday, "for a rest and to undergo some tests". She is expected to leave hospital on Monday.

Last week, the French celebrity gossip magazine Closer published accusations that Hollande is involved in an affair with Julie Gayet, a French actress.

The magazine published pictures that it claimed showed Gayet arriving at a Parisian flat, followed by another man, said to be a presidential bodyguard, and then Hollande himself. The story was subsequently removed from the magazine's website after Hollande threatened to sue the publication and hit out at "the attack on the right to privacy".

Hollande is yet to deny the affair. He is due to give a press conference on Tuesday, which had been scheduled as an announcement of key economic policies but which now looks likely to be dominated by questions about the affair and Trierweiler's health.

Trierweiler, Hollande's long-term partner, is a political journalist who has covered French politics for over 20 years for Paris Match magazine. The weekly French magazine once featured her on its cover under the headline "Hollande's charming asset".

Trierweiler, a twice-divorced mother of three teenage boys who comes from a modest family in eastern France, said during Hollande's presidential campaign that she planned to keep working to support her children, and that she did not want to be paid for by the state.

Valerie Trierweiler on the cover of Paris Match
Valerie Trierweiler on the cover of Paris MatchTwitter/AChrisafis