Sarah Michelle Gellar and 's little boy is growing up so fast! Freddie Prinze Jr.
The 39-year-old actress took to Instagram on Tuesday, Sept. 20 to wish her rarely-seen
son, , a wonderful fourth birthday — and the pic she posted of her youngest child is too cute for words! Rocky
"I'm knocked out that you are already four-years-old! #HappyBirthdayRocky," Sarah Michelle began her caption. "'Sometimes when you pick up your child you can feel the map of your own bones beneath your hands… This is the most extraordinary thing about motherhood — finding a piece of yourself separate and apart that all the same you could not live without.' This quote is from one of my favorite authors and completely sums up the love I feel for my children."
MUST SEE: Ellen Pompeo Shares Sweet Photo of Her Rarely-Seen Daughter Stella — See the Pic!
Sarah Michelle and Freddie, 40, welcomed Rocky in September 2012. The couple — who married in 2002 — are also parents to a seven-year-old daughter,
Click through the gallery below to see more of the cutest kids in Hollywood!
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Phinnaeus, Hazel, and Henry Moder
The kids of Julia Roberts and Danny Moder.
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Milo and Elizabella Bugliari
Thes son and daughter of Alyssa Milano and David Bugliari.
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Apple and Moses Martin
The daughter and son of Gwyneth Paltrow and Chris Martin.
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The daughter of Katie Holmes and Tom Cruise.
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Arabella, Joseph and, Theodore Kushner
The daughter and two sons of Ivanka Trump and Jared Kushner.
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The son of John Travolta and Kelly Preston.
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The son of Prince William and Kate Middleton.
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Gia and Dominic Lopez
The daughter and son of Mario Lopez and Courtney Mazza.
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Marion and Tabitha Broderick
The twin daughters of Sarah Jessica Parker and Matthew Broderick.
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Rhodes Gilbert Perry
The son of Sara Gilbert and Linda Perry.
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The son of Charlize Theron.
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Bowie Ezio and Cy Aridio Perego-Saldana
The twins of Zoe Saldana and Marco Perego.
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The son of Sandra Bullock.
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Knox and Vivienne Jolie-Pitt
The twins of Angelina Jolie and Brad Pitt.
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Charlotte Grace Prinze
The daughter of Sarah Michelle Gellar and Freddie Prinze, Jr.
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The son of Gwen Stefani and Gavin Rossdale.
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Max and Emme Muñiz
The twins of Jennifer Lopez and Marc Anthony.
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Sunday Rose and Faith Margaret Urban
The daughters of Nicole Kidman and Keith Urban.
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Violet, Seraphina, and Samuel Affleck
The children of Jennifer Garner and Ben Affleck.
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The son of Reese Witherspoon and Jim Toth.
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Liam, Stella, Hattie, and Finn McDermott
The kids of Tori Spelling and Dean McDermott.
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Milan and Sasha Piqué Mebarak
The sons of Shakira and Gerard Piqué.
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The son of Hilaria Baldwin and Alec Baldwin.
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The daughter of Jimmy Kimmel and Molly McNearney.
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Sadie Grace LeNoble
The daughter of Christina Applegate and Martyn LeNoble.
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The son Nick Lachey and Vanessa Lachey.
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Axl Jack Duhamel
The son of Fergie and Josh Duhamel.
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The son of Simon Cowell and Lauren Silverman.
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Holt Fisher Smith
The son of Tiffani Thiessen and Brady Smith.
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Otis Alexander Sudeikis
The son of Olivia Wilde and Jason Sudeikis.
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Philomena Bijou Jovanovic
The daughter of Daphne Oz and John Jovanovic.
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David Banda Mwale Ciccone Ritchie and Mercy James
The son and daughter of Madonna.
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The daughter of Prince William and Kate Middleton.
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River Rose Blackstock
The daughter of Kelly Clarkson and Brandon Blackstock.
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The daughter of David Beckham and Victoria Beckham.
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The son of Lucy Liu.
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Frankie Barrymore Kopelman
The daughter of Drew Barrymore and Will Kopelman.
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Moroccan and Monroe Cannon
The twins of Mariah Carey and Nick Cannon.
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Honor Marie and Haven Garner Warren
The daughters of Jessica Alba and Cash Warren.
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Mabel Ray and Evelyn Penn Willis
The daughters of Bruce Willis and Emma Heming Willis.
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The daughter of Mark Zuckerberg and Dr. Priscilla Chan.
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Carmen and Rafael Baldwin
The daughter and son of Alec Baldwin and Hilaria Baldwin.
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Krishna Thea Lakshmi-Dell
The daughter of Padma Lakshmi and Adam Dell.
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The son of Lauren Bush Lauren and David Lauren.
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The son of Carrie Underwood and Mike Fisher.
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The son of Justin Timberlake and Jessica Biel.
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Mila and Poppy Hager
The daughters of Jenna Bush Hager and John Hager.
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Grey and Sailor Gardner
The sons of Liv Tyler and David Gardner.
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Charlotte Clinton Mezvinsky
The daughter of Chelsea Clinton and Marc Mezvinsky.
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Zachary and Elijah Furnish-John
The five-year-old and three-year-old sons of
Elton John and David Furnish.
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Ryder Robinson and Bingham Bellamy
The sons of Kate Hudson.
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Benjamin and Vivian Brady
The kids of Gisele Bündchen and Tom Brady.
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Ella and Quinlin Stiller
The daughter and son of Ben Stiller and Christine Taylor.
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Ruby Sweetheart Maguire and Otis Tobias Maguire
The daughter and son of Tobey Maguire and Jennifer Meyer.
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Jovan "John John" Jovanovic
The son of Daphne Oz and John Jovanovic.
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Ava Marie Faustino
The daughter of David Faustino and Lindsay Bronson.
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The son of Anna Faris and Chris Pratt.
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Gideon and Harper Burtka-Harris
The twins of Neil Patrick Harris and David Burtka.
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Adrian Benjamin Colonomos
The son of Ginger Zee and Ben Aaroon.
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Lyric Sonny Roads Goldberg
The son of Soleil Moon Frye and Jason Goldberg.
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Weslie Fowler and Maddox Laurel Boss
The daughter and son of Allison Holker.
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Nahla Aubry and Maceo Martinez
The daughter and son of Halle Berry.
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Billie and Georgia Dane
The daughters of Eric Dane and Rebecca Gayheart.
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Jett and Ray Ling Song
The daughters of Lisa Ling and Paul Song.
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Kingston and Zuma Rossdale
The sons of Gwen Stefani and Gavin Rossdale.
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Charlotte and Rocky Prinze
The daughter and son of Freddie Prinze Jr. and Sarah Michelle Gellar.
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Marlowe and Major Martino
The daughter and son of Eva Amurri Martino and Kyle Martino.
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The son of Gwen Stefani and Gavin Rossdale.
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Ava Berlin Renner
The daughter of Jeremy Renner and Sonni Pacheco.
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Aviana Olea Le Gallo
The daughter of Amy Adams and Darren Le Gallo.