After the Hitchcock actress, 28, was spotted wearing a pear-shaped diamond ring in New York City on Monday, rumors began to swirl that Johansson and her French journalist beau, Romain Dauriac, may have taken their relationship to the next level.
But a rep for Johansson says she's not walking down the aisle.
"Scarlett is absolutely not engaged," her rep tells PEOPLE.
Even Johansson has said she isn't rushing to tie the knot, as she recently told ELLE UK that marriage is "really not important" to her.
"The only time I ever think about it is when people ask me, 'Would I get married again?' " she said at the time.
But Johansson – who was married to Ryan Reynolds for just over two years before divorcing in 2010 – recalled fond memories of her previous relationship.
She explained, "I got married when I was young and it was incredibly romantic and I liked being married, actually. But it is different. It's hard to put into words."
With Reporting By JULIE JORDAN