French first lady Valerie Trierweiler has been admitted to hospital following reports of an affair between President Francois Hollande and an actress, but will be discharged today, sources have said.

Daily newspaper Le Parisien said on its website yesterday that Trierweiler, 48, was taken to hospital after being shaken by a magazine’s reports of a liaison between her partner Hollande and French actress Julie Gayet.

“She has been in hospital since Friday. She will leave tomorrow,” her spokesman Patrice Biancone said. Asked about the future of Trierweiler’s relationship with the President, Biancone said: “She needs rest. Then she will decide what to do.”

A source at the Elysee declined to comment on Trierweiler’s hospitalisation and the report.

“The President is at work. He is preparing Tuesday’s news conference,” the source said.

Tomorrow, Hollande will face the media in a traditional new year news conference that had been scheduled well before the reports of the affair broke. Hollande, who came to power in May 2012, is expected to announce measures to boost the French economy.

Hollande and Trierweiler are scheduled to make a State visit to the US next month and are set to attend a state dinner with President Barack Obama and his wife Michelle on February 11.

On Friday, Hollande, 59, threatened to sue celebrity magazine Closer, complaining of breach of privacy after it said he was having an affair with Gayet, 41.

Closer published a series of photos of a woman resembling Gayet entering a Paris flat close to the Elysee presidential palace, followed by a man masked by a black motorcycle helmet who the magazine said was Hollande.

Gayet, a mother of two, has dozens of film credits to her name but is little known outside France.

In March last year she filed a complaint with the Paris prosecutor for breach of privacy over internet rumours alleging she had a relationship with Hollande.

Hollande, who has four children from a previous relationship, and Trierweiler, a journalist for magazine Paris Match, are not married but have been in a relationship for several years.