"Happy 18th birthday coco! I’m so proud to be your mom. You are courageous, smart, deep, funny, unique and beautiful with the biggest heart. I can’t wait to see what’s next. I love you x," the Friends alum, 57, captioned a few photos via Instagram.
In May, the TV star shared some more another snapshot. "Happy Mother’s Day! I’m so grateful to @jennikayne to have captured this moment," she wrote.
Cox and her daughter are really close, but soon enough, Coco will be going off to college. "She's going to go as far away from L.A. as she can get," she told Ellen DeGeneres on her talk show. "We are so close, but she just can't wait to go away and live on her own. It's sad."
- Courteney Cox & David Arquette's Daughter Coco Shows Off Her Svelte Figure — And Jennifer Aniston 'Likes' The Photo!
- Lovely Ladies! Courteney Cox Posts Rare Photos With Daughter Coco For Mother's Day
- Mother-Daughter Duo! Courteney Cox Looks Ageless During Rare Red Carpet Appearance With 18-Year-Old Coco Arquette
Fortunately, it seems like Cox isn't too down in the dumps, as her daughter is very independent.
"There are people that get that empty nest syndrome ... I haven't even thought about it. I think [Coco]'s doing such a good job at prepping me for this. She never leaves her room," she admitted. "She's never home, and if she is, literally the door is shut and I don't know what she's doing back there. But I don't think I'm going to be as affected."
For now, Coco will be studying hard at school, but it wouldn't surprise Cox and her ex David Arquette if their child follows in their footsteps.
"She's really so super talented. She's got so much confidence," the actor previously told Us Weekly. "She's got a really great head on her shoulders and she's really so much more talented than I could ever imagine."