“I have so much of something in my teeth. #chewsdaytuesday,” the Anger Management star, 45, captioned the mother-son photo.
Last month, the Cruel Intentions actress shared birthday greetings for her only child.
“Happy sixth!! Birthday! #arthursaint you have my heart. You are my light,” wrote the proud mama.
The Hellboy star and her ex Jason Bleick welcomed their son on July 25, 2011.