After dating for more than a year, Scarlett Johansson is set to marry her boyfriend Ryan Reynolds, PEOPLE has learned exclusively.

“They’re both thrilled,” Johansson’s rep Marcel Pariseau tells PEOPLE.

Reynolds, 31, currently filming the aptly named The Proposal in Boston with Sandra Bullock, recently popped the question to Johansson, 23. The couple have not set a wedding date.

The Nanny Diaries star is expected to show off her sparkler at Monday night’s Metropolitan Museum Costume Institute Gala in New York. Sources say Johansson is eager to “show off her rock” with her Dolce & Gabbana gown.

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Sandra Bullock and Ryan Reynolds were spotted between scenes while filming ‘The Proposal’ in Rockport, MA on Thursday.

“The Proposal” concerns a demanding female boss (Bullock) faced with deportation to Canada who agrees to a sham engagement and marriage with her young male assistant (Reynolds).

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Word from spywitnesses is that “The Proposal” star Ryan Reynolds and his galpal, Scarlett Johansson, had a bit of a lovers’ spat in the Financial District the other day.

According to someone who was there, the Tinseltown lovebirds were walking on Arch Street down by the church and having a raaather heated discussion.

“The Ryan guy was clearly being a baby,” said our spy. “She kept grabbing his arm and he’d yank it away and she’d keep saying ‘Ry, come on, Ry. Stop.’

“He kept switching directions on the sidewalk like he wanted her to leave, responding over and over, ‘Roger that!’ – whatever that was supposed to mean.”

The hostilities ceased when the couple noticed that there was a photographer trailing them.

“He grabbed her hand and stormed away,” said our snoop.

Reynolds, of “Definitely, Maybe” fame, is in town filming “The Proposal” with Sandra Bullock and Scarlett Johansson was in town visiting him.

And if you believe the tabloids – and who doesn’t – there has been some trouble in lovelyland for the Tinseltown twosome. Word is, the couple is going through “a rough patch,” because Reynolds, 32, wants to tie the knot and his galpal is just 23 and very focused on her career at the moment.

“Scarlett is younger and has no desire for a husband or family just yet,” a source told London’s Daily Mail.

Guess you could say she rejected The Proposal.

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According to sources, Ryan Reynolds is set to star in the new X-Men movie, X-Men Origins: Wolverine. Hugh Jackman is going to reprise his role as Wolverine.

A source said: “Fans were excited by rumors the film would feature Deadpool because he’s a legendary villain for Marvel comics readers. So they’ll be delighted to know Ryan’s going to play him.

“Deadpool is a mentally unstable mercenary, with special healing powers just like Wolverine’s. He is full of funny one-liners and wisecracks. It’s just the sort of thing Ryan is great at.”

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So hot!

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Rachel Weisz, Ryan Reynolds, Isla Fisher, and Abigail Breslin at the World Premiere of Definitely, Maybe at the Ziegfield Theatre in New York City on Monday.

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