Carla Bruni has done little to end speculation about her relationship with French president Nicolas Sarkozy by giving a half-hearted response when questioned about whether her marriage "was forever"

While discussing her husband, she was asked: "Is he for keeps -- is he forever?"

After a long pause, she 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."

Speculation has been rife in recent days on Twitter, in blogs and on the website of a respected French newspaper -- that both Bruni and her husband are having extramarital affairs.

The rumours allege that she has moved in with Benjamin Biolay, a French musician six years her junior, while Mr Sarkozy has sought "comfort" in the arms of his ecology minister, Chantal Jouanno, a karate champion who has strenuously denied the claims.

However, in the interview she said of her husband: "He would never have affairsu00a0... have you ever seen a picture of him having an affair?"