Mary-Kate Olsen (Back left) and Olivier Sarkozy Photo:CFP

Former child star and fashion designer Mary-Kate Olsen has married Frenchman Olivier Sarkozy - the half-brother of former French President Nicolas Sarkozy - in a quiet New York ceremony, her former Full House TV co-star said on Monday.

Bob Saget, who appeared with Olsen and her twin sister Ashley on the 1990s US TV comedy, confirmed reports during an appearance on NBC's Today show that the two had wed.

"I was not invited, but I'm very happy and I sent a 'Mazel tov' text," Saget told Today. "I'm very happy. I love her very much."

Olsen, 29, and Sarkozy, 46, a banker who is based in the US, had been dating for about three years and were engaged in 2014.

Reuters