Catherine Zeta-Jones is paying tribute to her father-in-legislation, screen icon Kirk Douglas, following his demise on Wednesday at age 103.

The actress — who is married to the celebrated star’s seventy five-calendar year-outdated son, Michael Douglas — has been close with her father-in-legislation since she and Michael tied the knot in November 2000, frequently sharing sweet pics and tributes to the legendary actor on social media.

In remembering Kirk on Wednesday, Catherine posted a sweet black and white photo of her kissing her father-in-legislation on the cheek. “To my darling Kirk, I shall love you for the relaxation of my everyday living. I miss out on you by now. Slumber tight…” she captioned the pic. 

Kirk just celebrated his 103rd birthday back again on Dec. 9, and Catherine commemorated the event with a heartfelt snapshot of the Spartacus star sitting on her knee.

“This man on my knee, is 103!!!!!