One of the most important lessons for observers of celebrity parents is that teenagers will always be teenagers, and therefore will always be absolutely mortified by their parents, whether they call them their most flirtatious childhood nicknames in front of their No. 1 crush or, in the case of Gwyneth Paltrow, instantly share viral nude photos to celebrate her birthday. The thing is, whether it's sharing viral nude photos or not, it's always absolutely mortifying to parents. When Paltrow shared a stunning nude on Instagram on Sunday ("I'm only wearing my birthday suit today..." ), her 16-year-old daughter Apple Martin responded in the most teenage way in the comments: "Mom."

But Martin followed up with another sweet comment: "You're killing it. These two! Very cute mother-daughter duo.

In May, Paltrow celebrated Martin's 16th birthday by sharing a touching tribute to his "darling daughter." 'You are a light in my heart and a pure joy. You are so intelligent, you have the best sense of humor, you are dry and wonderful. I have the most fun being your mother," she wrote, along with a photo of Martin. I love our nightly chats. Whatever it is you want to accomplish, you work hard to get it and have plenty of grit and commitment. I am so lucky to be your mother. Thank you for choosing me. I love you so much that I could fit you to the moon and back". Again, a very good mother-daughter duo.