They grow up so fast.
"I’m a bit of a loss for words this morning (😭). I could not be more proud of the woman you are. You are everything I could have dreamed of and so much more. Proud doesn’t cover it, my heart swells with feelings I can’t put in to words," Paltrow wrote on Instagram alongside a photo of Martin donning a white dress.
The Goop founder continued: "You are deeply extraordinary in every way. Happy birthday my darling girl. I hope you know how special you are, and how much light you have brought to all who are lucky enough to know you. Especially me. I say it all the time and I will never stop… in the words of auntie Drew, I was born the day you were born. I love you. ❤️ Mama."
Gwyneth Paltrow jokes:about including 'Goop' in the title of her new Netflix series
Paltrow shares two kids with Coldplay's front man Chris Martin, Apple Martin and Moses Martin, 16.
The "Politician" star rarely shares photos of her children on social media mostly reserving the appearances for birthdays and holidays like National Son Day or National Daughter Day.
During an appearance on "Today" in 2020, she made a hilarious revelation about what it's like to be the mom of teens.
"It's the best," Paltrow said. "They're really coming into themselves. They're hilarious, they're smart, they can talk, they can sort of muse about things. It's just the greatest."
She ended the comment with a joke about how "once in a while" her kids weren't so great.
A few months prior, Paltrow commemorated her family's vacation by posting a photo of her and her daughter on Instagram — but Apple wasn't too pleased.
"Mom we have discussed this," 14-year-old Apple shared in the comments section of her mom's post. "You may not post anything without my consent."
The actress shot back, “You can’t even see (your) face!”
Contributing: Cydney Henderson
This article originally appeared on USA TODAY: Gwyneth Paltrow celebrates daughter Apple's 18th birthday with message