Fashion Accessories Tech Gwyneth Paltrow Celebrates Son's Birthday with a Selfie By Meredith Lepore Meredith Lepore Meredith Lepore is a writer and editor based in New York who covers all things fashion, celebrity, and pop culture. Her work has been published in The Observer, Travel + Leisure, Refinery29, Bustle, InStyle, Marie Claire, Self, Women's Health, and Cosmopolitan. InStyle's editorial guidelines Published on April 9, 2015 @ 11:44AM Pin Share Tweet Email Photo: Instagram/gwynethpaltrow Gwyneth Paltrow has something major to celebrate this week: Her son Moses turned 9 years old yesterday, April 8. The proud mom commemorated the special day with a cute mother-son photo (above), which she shared on Instagram. She captioned it, "Happy 9th birthday my sweet Moses! You are an incredible, amazing, beautiful boy inside and out." Awwww! We know Moses must be having a pretty good birthday week as he went to Puerto Vallarta, Mexico, over the weekend with both Mom and Dad, Chris Martin, as well as big sister Apple. Paltrow spent time at the beach in a unique bikini with the family. And on Easter, Paltrow gave Moses and Apple two adorable rabbits (what a fun mom!): Gwyneth Paltrow Hits the Beach in Scalloped Bikini sith Chris Martin Moses's big day wasn't the only birthday Paltrow celebrated this week. On April 5 she shared a snap of herself with her friend and Iron Man co-star Robert Downey Jr. to celebrate his 50th birthday. She attended his start-studded party in Santa Monica along with fellow party guests Jennifer Aniston, Jason Bateman, Reese Witherspoon, and Katie Holmes. PHOTOS: See Paltrow and More Stars Rock Their Bikinis