Hollywood actress sparks rumours of a secret marriage!

It looks like Scarlett Johansson may have pulled a Mary-Kate Olsen and tied the knot in secret!

The actress was spotted with a diamond band underneath her engagement ring when she hosted a fundraiser for Hurricane Sandy in New York on Tuesday.

Scarlett and her rumoured husband, French journalist Romain Dauriac, became engaged in September of last year and welcomed their daughter, Rose Dorothy, last month. 

The actress, who was previously married to Ryan Reynolds until 2011, said after her engagement that she was in no rush up the aisle: "Being engaged is an exciting time to enjoy and really savour."