Former child star Mary-Kate Olsen has reportedly secretly married her fiance, Olivier Sarkozy.

Mary-Kate Olsen (right) with Olivier Sarkozy. Photo: Getty

The 28-year-old actress-turned-fashion designer became engaged to the French banker in February after two years of dating.

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Now editors at Lucky magazine claim the couple have quietly tied the knot.

The news emerges weeks after the notoriously private couple were photographed wearing matching gold bands in the Hamptons, New York, last month.

At 45, Sarkozy is 17 years older than his reported new wife.

The Frenchman, the half-brother of former French president Nicolas Sarkozy, has two children from a previous marriage.

A representative for Olsen is yet to comment on the marriage report.

She previously dated artist Nate Lowman for two years before they split in 2010.