CSI finale: Marg Helgenberger and William Petersen pose in behind-the-scenes photo

Grillows is once again super real on the set of the two-hour CSI finale.

Marg Helgenberger posted the above photo on her Instagram on Monday, writing, “I am crazy about this wonderful man!” adding the blue heart emoji of true, inter-castmate love.

The actress also known as Catherine Willows has not been shy about sharing photos from behind the scenes of the highly anticipated special; last week, she posted yet another smiley photo of herself with Petersen, with the hashtags “Grillows” and “CSI4EVER.”

If only, Helgenberger. If only.

The two-hour send-off is set to air Sept. 27 on CBS.

•Marg Helgenberger teases CSI finale with behind-the-scenes reunion photos

•Elisabeth Shue won’t return for 2-hour CSI special

•CSI casts Faking It star Katie Stevens for two-hour send-off