Back together, the couple step out for karaoke night with his family in Massachusetts
Credit: Ernesto Distefano/Getty; Michael Loccisano/Getty

Chris Evans and Minka Kelly are working on a sequel – to their romance.

After breaking up last year, the on-and-off couple have been back together for the past few months, a source tells PEOPLE.

And they’re serious enough to spend time with his family – at karaoke night in his home town.

The Captain America star, 33, and Kelly, 34, who recently starred on the FOX series Almost Human, spent a night out recently at Lavender Asian Cuisine & Bar in Sudbury, Massachusetts, onlookers tell PEOPLE.

“It looked like a family night out,” says a fellow patron. “They were with a bunch of people, including Chris’s family, and Chris and Minka sat in the back while other people in their group got up and did some karaoke.”

“They looked like they were having a great time,” says the onlooker. “They all got into the locals singing karaoke.”

The pair, who reportedly first dated in 2007 before rekindling in 2012, were back on form on their visit back to the upscale Boston suburb where Evans grew up.

Adds a second witness, “They sat next to each other, they were off in a corner, having drinks and keeping to themselves but still part of the group. They kept a very low profile. They’re really cute!” • Reporting by JENNIFER GARCIA