Royals August's First Halloween! Princess Eugenie and 6-Month-Old Son Celebrate with 'Little Monster' Costume Princess Eugenie and husband Jack Brooksbank welcomed their first son in February By Abigail Adams Abigail Adams Instagram Twitter Digital News Writer, PEOPLE People Editorial Guidelines Published on October 31, 2021 06:20 PM Share Tweet Pin Email Photo: Princess Eugenie/Instagram Princess Eugenie's son August is celebrating his first Halloween! The royal, who gave birth to her first child in February, shared a pair of photos of her baby boy in a blue, fuzzy monster costume on Instagram Sunday. For the holiday, Eugenie, 31, posted a photo of her 6-month-old son playing with a stuffed toy minion. "🎃 👻... wonder what they are talking about..," she wrote alongside the sweet image of August. Brother-in-law Edo Mapelli Mozzi left a laughing emoji and red heart emoji in the comments section of Eugenie's Halloween post. Sarah Ferguson's Best Photos with Daughters Princess Beatrice and Princess Eugenie Through the Years And on her Instagram Story, Queen Elizabeth's granddaughter shared another photo of her son crawling around on the carpet, with his five eyes and two orange horns pointed directly at mom. "At least my little Halloween monster is scary..," she joked, referencing her attempt at carving a scary-looking pumpkin she posted earlier in her Story. Can't get enough of PEOPLE's Royals coverage? Sign up for our free Royals newsletter to get the latest updates on Kate Middleton, Meghan Markle and more! Princess Eugenie/Instagram Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories. Princess Eugenie/Instagram Eugenie and husband Jack Brooksbank welcomed son August on Feb. 9 at The Portland Hospital, Buckingham Palace had announced in a statement. He is the first grandchild for Eugenie's parents Prince Andrew and Sarah Ferguson and the 12th great-grandchild for the Queen. Sarah Ferguson Says She Feels 'Thrilled and Blessed' as First-Time Grandparent to Princess Eugenie's Son Sarah Ferguson and Princess Eugenie. Ian West/PA Images via Getty Celebrating the baby's birth, the Duchess of York, 62, called her grandson "a beautiful blessing and a bringer of such love and joy to all our Family" in a post on Twitter. "I am so proud of Jack and Eugenie, they are and will be wonderful parents," she added at the time. Recently, she became a grandmother for the second time when Princess Beatrice and her husband Edo Mapelli Mozzi welcomed their first child, daughter Sienna Elizabeth on Sept. 18.