Celebrity Parents Nicky Hilton Welcomes a Baby Boy with Husband James Rothschild: 'Officially a Party of Five!' The new arrival joins the couple's daughters Teddy, 4, and Lily-Grace, 5½ By Angela Andaloro Angela Andaloro Twitter Angela Andaloro is a Parents News Writer at PEOPLE. Angela has also written about entertainment and parenting at LittleThings, Mom.com, BuzzFeed, and more. In her spare time, she enjoys competing in fantasy sports leagues and watching too much reality TV. People Editorial Guidelines Published on July 5, 2022 12:41 PM Share Tweet Pin Email Photo: Stefanie Keenan/VF22/WireImage Nicky Hilton Rothschild's baby boy is here! On Tuesday, the fashion designer, 38, announced the arrival of her third baby with husband James Rothschild on Instagram. "We are officially a party of 5!" she wrote, sharing a black-and-white silhouette image of the proud parents. "Welcome to the world sweet boy. Mom, dad and big sisters could not be more smitten. 💙" The couple hasn't shared the baby's date of birth or any further details at this time. Nicky and James also share daughters Theodora "Teddy" Marilyn, 4, and Lily-Grace Victoria, 5½. The two will celebrate their seventh wedding anniversary this summer. 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. Recently, Hilton Rothschild shared Instagram photos while hitting the pool with her sister-in-law Tessa Hilton, who is also expecting a baby, her second child with husband Barron Hilton. The pair laid poolside in matching swimsuits with their baby bumps on display in the pictures. "Suns out ☀️ Bumps out 🤰," Nicky captioned the post. "Can't wait for the cousins to meet each other! 🥰." Pregnant Nicky Hilton Puts Baby Bump on Display in Floral Dress During New York City Outing Nicky Rothschild/Instagram In May, Hilton Rothschild celebrated her baby on the way, a boy, with an all-things blue baby shower. She shared moments from the festivities in an Instagram carousel, beginning with a photo of her holding her baby bump as she posed with sister Paris Hilton. "Showered with so much love at baby boy's sprinkle.🧸💙🍼," Nicky captioned the photos, which ended with Lily-Grace and Teddy indulging in sweet treats. One snap showed an adorable girl hiding under a life-size teddy bear. The same month, mom Kathy Hilton predicted it wouldn't be long until she was traveling to New York for the arrival of her grandson. "Nicky is easy. I fly in [to New York] for all the births," she told PEOPLE. "I'll be there holding her hand. It'll be in the next five or six weeks." PEOPLE confirmed in January that Nicky and her husband of nearly seven years were expecting their third child together.