Aguilera, who recently filed for divorce from husband Jordan Bratman, had a festive night out with Rutler at the Abbey in West Hollywood on Nov. 24. The couple were seen dancing, according to an onlooker, who added: "Christina was in a great mood and seemed very into Matt."
Aguilera, 29, spent Thanksgiving in Los Angeles with friends. Then after the holiday, the singer and Rutler, who worked as a set assistant on her film Burlesque, jetted to New York, while her son Max stayed with his dad for the holiday weekend.
"This is the first Thanksgiving she was without Max," says a source. "It was really hard for her and she was feeling sad, so she decided to go to the East Coast with Matt and a group of friends."
On Saturday, Aguilera, Rutler and a few pals went to Rhode Island for a spontaneous visit to Rutler's family home where they spent time with his mom, Kathleen.
"Since his family lives so close, they decided to drop in for a few hours," says the source.
But the source insists that meeting the family doesn't mean Aguilera and Rutler are getting more serious. "They’re still getting to know each other better," says the source.
That night, the couple partied at the Boom Boom Room atop the Standard Hotel together in New York City.
With reporting by PERNILLA CEDENHEIM