Don't worry about the CSIs being too tough on the lovebirds. Christine and Mac do have a shipper on their side with coworker Jo Danville (Sela Ward). Showrunner Pam Veasey tells us that Jo will not let the team get too many jabs in: "Jo is policing this relationship quite diligently. She's protective of him at the same time she's his worst enemy when it comes to relationships because she's pushing him out there." 

Hopefully this birthday party goes well because Mac will need all the love and support he can get! In the season finale, Mac's life will hang in the balance. Dun. Dun. Dun. 

Check out CSI: NY's penultimate episode tonight at 9 p.m. on CBS.