Are they back on?

Kourtney Kardashian rang in the new year on a ski trip with her sisters in Aspen, and she extended an invite to former (and maybe current?) fling Luka Sabbat!

"Kourtney invited Luka to come on the trip with them because he is friends with the whole group of girls and she thought it would be fun. He's been hanging around a lot and Kourtney is always excited to see him. Luka meshes really well with the group and all of the sisters love having him around," a source dished to E! News.

"There is still a lot of chemistry between Kourtney and Luka and they never fell out of touch, but nothing serious is going on. Kourtney is not dating anyone and is truly having fun. Kourtney seemed to be enjoying herself and was always smiling. She is very friendly with Luka but they were always with a group," the source added.

Maybe she should find some more age appropriate than this 21-year-old? Just a thought!