Francois Hollande: All the president's women
Here BBC News profiles the women in - or alleged to be in - the life of the man at the helm of the EU's second-biggest economy.Julie Gayet
Mr Hollande has hit out at what he describes as an invasion of privacy, but has not denied a report that he is having a relationship with the actress Julie Gayet, a mother of two, a mother of two, behind the back of his official partner, Valerie Trierweiler.
French gossip magazine Closer has published claims of an affair going back two years, which would pre-date his election as president in May 2012.
They allegedly snatched weekends together in the south of France, and Mr Hollande is said to have made excuses to avoid a holiday in Greece last year with Ms Trierweiler, so he could travel instead to his Correze constituency with Ms Gayet.
The 41-year-old is fairly well known in France, if not internationally, and once appeared in one of Mr Hollande's election campaign television adverts.
In that video (in French), she described him as "a humble man," who "really listens".
Rumours of their alleged relationship have been circulating on the internet for many months. Ms Gayet filed a complaint with prosecutors in Paris in March 2013 against various bloggers and websites that were reporting on the rumours.
She is suing Closer over the original photo report it published on 10 January about the alleged affair.
Ms Gayet played a leading role in Quai d'Orsay, a 2013 satirical film centred on the French foreign ministry. Her filmography also includes the titles Shall We Kiss? and My Best Friend among dozens of others.
She is the daughter of a wealthy surgeon and married the Argentine-born film director and scriptwriter Santiago Amigorena in 2003. The pair have since separated.Valerie Trierweiler
The president's official partner was taken to hospital "for rest and some tests" following Closer's scoop. A friend was quoted by French magazine Le Point as saying she had taken "one pill too many", but denied it was a suicide attempt.
Hollande 'love triangle' timeline
1988: Francois Hollande first meets Valerie Trierweiler, she a journalist, he a Socialist Party MP with a steady partner, Segolene Royal
Family years: Trierweiler raises three children with her second husband, Denis Trierweiler, while Hollande raises four with his unmarried partner, Royal
November 2007: Trierweiler announces in an interview that she is Hollande's new partner, six months after he leaves Royal, who has just been defeated as the Socialist presidential candidate against Nicolas Sarkozy
Early 2012: Hollande allegedly begins affair with actress Julie Gayet, who has two children from her first marriage to Santiago Amigorena
May 2012: Trierweiler, still officially Hollande's unmarried partner, becomes First Lady of France after his victory over Sarkozy in the presidential election
June 2013: Trierweiler wins damages of 10,000 euros (£8,300: $13,675) from the authors of a book entitled The Troublemaker, which made allegations about her private life before Hollande's election
January 2014: Trierweiler is admitted to hospital after Closer magazine publishes a report on Hollande's alleged affair with Gayet, accompanied by photos
After staying away for nearly a week, apparently at the doctors' request, Mr Hollande visited her in hospital on 16 January.
Ms Trierweiler, 48, is a journalist who writes for Paris Match magazine and has presented discussion programmes on French television. She moved in with Francois Hollande after his official separation from Segolene Royal in 2007, and was divorced from her own husband, with whom she has three children.
When the Socialist candidate was elected president, Ms Trierweiler moved into the Elysee Palace with him and has accompanied him on official trips.
As first lady, she has her own publicly funded staff and office, and lives in a wing of the palace.
She controversially took to Twitter in June 2012 to back an opponent of Ms Royal in parliamentary elections.
She subsequently apologised for her comments, saying: "I had not yet realised that I was no longer a simple citizen." Francois Hollande's son Thomas, by his previous relationship with Segolene Royal, said in the wake of the incident that he and his siblings no longer wanted to see Ms Trierweiler.
Last summer, she won damages of 10,000 euros (£8,300; $13,600) from the authors of a book entitled The Troublemaker, which made allegations about her private life.
Closer and two other magazines, Voici and Public, were fined by a Paris court in October 2012 for publishing photos of Ms Trierweiler in a bikini.Segolene Royal
Francois Hollande has four children, now adults, with Ms Royal, herself a prominent French Socialist. The pair met at a university party and were once French politics' power couple, both harbouring ambitions to be president of France.
Although they never married, the couple were together for about three decades, officially splitting up shortly after the 2007 presidential election.
Ms Royal, 60, was the Socialist candidate in that vote - the first woman in France to be nominated by a major party - but lost to Nicolas Sarkozy.
One of the ironies of Mr Hollande's current crisis is that Ms Royal reportedly visited the same hospital where Ms Trierweiler was being kept. However, she is said to have been there for dental treatment and they did not meet.