But celebrity designer refuses to reveal all details about the gown

Stella McCartney has confirmed she’ll be designing Scarlett Johansson’s gown for her wedding to Ryan Reynolds.

Scarlett, 23, and Ryan, 31, announced their engagement on Monday.

‘I’m definitely doing her wedding dress,’ Stella says.

But the designer, 36, refuses to reveal any details of the design.

‘I’m thinking of some kind of dodgy, black thing – Latex,’ she jokes to the Daily Star.