Not sure how long my marriage will last: Carla Bruni

London: Adding fuel to speculation about their extra-marital affairs, French First Lady Carla Bruni has claimed that she isn't sure how long her marriage to President Nicolas Sarkozy would last.

In an interview to Britain's 'Sky News', the former Italian supermodel-turned-singer described her relationship to Sarkozy as a "fairy tale" but gave a halfhearted response when asked about whether her marriage "was forever".

While discussing her 55-year-old flamboyant husband, Bruni was asked: "Is he for keeps -- is he forever?"

After a long pause, the 43-year-old First Lady replied: "I guess marriage should be forever but who knows what happens. I wish it was forever, that's my hope but we could be dead tomorrow."

Rumours have been doing the rounds in recent days that Sarkozy and Bruni, who wed in February 2008, just three months after meeting in November 2007, are cheating on each other.

While the President is said to be romancing his 40-year-old Ecology Minister, also a karate champion, Bruni is rumoured to be involved with Benjamin Biolay, a mop-haired pop star six years her junior.