Alberto E. Rodriguez/Getty Images
September 29, 2015 at 05:25 PM EDT

Talk about a picture-perfect moment: Chris Evans and Hayley Atwell were posing for a photo with fan Kelsey Jenkins — decked out in Black Widow garb — at Utah’s Comic-Con convention when her boyfriend swooped in for a surprise proposal. 

“It was one of the most moving and beautiful things I have been witness to,” Atwell later tweeted. “Congratulations to you both. May you have a blissful future xx.”

Jenkins tweeted out a photo of the moment, and both she and her new famous friends look visibly (and pleasantly) shocked in the pic. See that picture, as well as Atwell’s celebratory tweets, below.

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