Scarlett Johansson has sparked engagement rumours by wearing a huge sparkler while out walking with boyfriend Romain Dauriac.

The 28-year-old Hitchcock actress - who started dating the French journalist just weeks after her split from advertising executive Nate Naylor in October - was snapped out in New York this week with a pear-shaped diamond on her ring finger.

Scarlett and Romain, 30, held hands as they went on a visit to a tattoo parlour in the East Village, according to the New York Daily News.

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But the blonde beauty - who split from Ryan Reynolds in December 2010 after a two-year marriage - told the February issue of Elle UK: "I never think about marriage. Is that weird? It's really not important to me."