By Mandi Bierly
Updated August 12, 2011 at 09:49 PM EDT

I love me some Rizzoli & Isles, and if you’re wondering whether the chemistry between stars Angie Harmon and Sasha Alexander is as good offscreen as on, watch the video below of them dancing their way out of the makeup trailer and into Isles’ autopsy room in honor of Harmon’s birthday earlier this week. The three-minute video was shot by the show’s hair stylist Nanci Cascio, who also captured Harmon leading a dance party in the trailer at the end of July. (“How long is this f—in’ song,” her costar Bruce McGill asked waiting his turn in the chair. Hilarious.) Watch that below as well.

What I love most about these videos, besides the fact that in them both Harmon and Alexander are great dancers and don’t take themselves too seriously, is that they weren’t created for marketing purposes. The joy is too genuine for that. And to reward them, I’ll plug the show: Rizzoli & Isles airs Mondays at 10 p.m. ET on TNT.