Stella McCartney offers to design Scarlett Johansson's wedding dress

... and the bride wore black. Designer Stella McCartney has joked she will design a 'black latex' wedding gown for actress Scarlett Johansson. Photo / Reuters

Stella McCartney wants to design a black latex wedding dress for Scarlett Johansson.

The British fashion designer, the daughter of Beatles legend Sir Paul McCartney, believes the unusual sexy gown would be perfect for when Johansson marries actor Ryan Reynolds.

McCartney, who designed Madonna's dress when she married director Guy Ritchie in 2000, joked: "I'm definitely doing her wedding dress - but she doesn't know it yet! I am thinking of some kind of dodgy, black thing. Latex! Latex for Scarlett!"

The designer said she was delighted the 23-year-old actress - who proudly showed off her

diamond engagement ring

at New York's

on Monday night - was planning to tie the knot with Reynolds.

"I am so thrilled for her," McCartney said.

- BANG! SHOWBIZ