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Kelly, 32, dated Yankees superstar Derek Jeter from 2008 to 2011, and she was also linked to That '70s Show star Wilmer Valderrama more than once. But now it seems she's back with the Avengers star, 31.
The pair, who reportedly dated briefly in 2007, have apparently been hanging out again.
"She did a number on him him back then, but she reached out to Chris this time," a source told Us Weekly about their meeting back up again.
The pair were spotted together in Evans' Boston-area hometown, eating at Max and Dylans on Aug. 18.
"They were at a table for two downstairs," a witness told the Boston Herald. "They didn't have a reservation, and apparently just came in around 1:30 p.m. They were kissing and holding hands, and the average bystander could clearly tell they were dating."
Just six days later they were in the Big Apple, taking in the hit Broadway musical The Book of Mormon together.
Still, Evans -- whose romantic history includes Jessica Biel from 2004 to 2006 -- is keen on taking it slow. According to a source, he's "still a little insecure, so he's being cautious."