She’s consciously amazed by how fast time has flown by.

Gwyneth Paltrow can’t believe her sonwith ex-husband Chris Martinis so grown up.

Taking toInstagramFriday, the Oscar winner gushed about Moses on his sixteenth birthday.

Gwyneth Paltrow close up

“I’m not sure how I’m writing that number,” Paltrow continued.

Moses also shows up every once in a while on Paltrow’sInstagram.

I love you so much, you’ve got the option to’t fathom it."

Moses Martin in Instagram birthday post

This year, Paltrow had even more sweet words for her second born.

You are deeply special to all who know you.

I am so lucky to be your mama."

Gwyneth Paltrow with her kids, Apple and Moses

Could Moses be taking after his dad, Chris Martin, with his budding musical talent?

Her Coldplay singer ex has beenin a relationship with Dakota Johnsonsince 2017.

Still, the 49-year-old admitted there are challenges co-parenting with Chris Martin.

That said, she also told fans on her recent Instagram Live that she loves Johnson (viaGlamour).