Celebrity Parents Harry Potter's Jessie Cave Welcomes Son Abraham Benjamin After 'Slightly Extreme' Labor "This has been a very different experience to my first two births ... much more humbling, terrifying and out of my control," she said By Benjamin VanHoose Benjamin VanHoose Twitter Benjamin VanHoose is an Associate Editor on the Movies team at PEOPLE. He's worked at PEOPLE for over three years as a writer and reporter across our Entertainment, Lifestyle and News teams, covering everything from the Johnny Depp v. Amber Heard trial to the Oscars. He regularly covers red carpet events and has interviewed stars like Drew Barrymore, Ryan Reynolds and Kirsten Dunst. He previously worked as a copy editor at Topix Media Lab. People Editorial Guidelines Published on October 22, 2020 11:37 AM Share Tweet Pin Email Photo: Jessie Cave/Instagram Jessie Cave has a new baby boy in the family! The Harry Potter actress, 33, announced on Instagram Thursday that she and comedian Alfie Brown welcomed their third child together, a son named Abraham "Bam" Benjamin. The newborn arrived "in the early hours" of Wednesday morning "just 40 mins after my waters were broken," Cave wrote. "Slightly extreme but so were his kicks throughout the pregnancy!" joked the mom of her new son, who joins older sister Margot, 4, and brother Donnie, 6. She posted an intimate snapshot, taken by Brown, of herself cradling the newborn for the first time in her hospital bed. "This has been a very different experience to my first two births ... much more humbling, terrifying and out of my control," Cave explained. "We are currently in the neo natal unit but he's a strong boy and it's the safest place for him right now." "The midwives (Magda & Daisy) and the doctors and neo natal nurses have been amazing (our first one to welcome us into the ward was named Rosaria and she was extremely comforting)," the actress said. Cave, who played Lavender Brown in the Potter films, thanked fans for "all the cosmic well wishes," and commended her partner for being at her side during the delivery. Never miss a story — sign up forPEOPLE'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. Pregnant Jessie Cave Reveals She Had an 'Allergic Reaction to an Almond' "Thank you to @alfiebrowncomedian for being so wonderful (again) and taking this picture in the seconds after he was born and just moments before he was wheeled away out of our arms ... honestly one of the hardest moments of my life....," she wrote. "Hopefully he will be with us soon and it will be even more perfect ❤️," Cave concluded. "And BIG LOVE AND RESPECT for all the mothers who've experienced the neonatal unit before us, along with us. 🤞🤞🤞🤞🤞🤞🤞 #NHS" Cave announced her pregnancy in June, sharing a photo of herself showing off her baby bump under a blue-and-white polka-dot skirt. "Oops I did it again 🤰🥰 ❤️ 🍂," she wrote at the time, crediting younger sister Bebe Cave for the shot. RELATED VIDEO: Mindy Kaling Reveals She Has Given Birth to a Baby Boy: 'This Is News to a Lot of People' RELATED GALLERY: Welcome to the World! See All of the Celebrity Babies Born in 2020 "Happy Father's Day to the best 💕," Cave captioned a tribute to Brown over the summer, posting a slideshow of pictures of him with their kids. Cave is the latest Potter alum with a new addition in the family. Scarlett Byrne, who played Pansy Parkinson in the franchise, welcomed a baby girl with husband Cooper Hefner in August. Additionally, Rupert Grint, who portrayed Lavender's one-time love interest Ron Weasley in the movies, welcomed his first child, a daughter, in May. "Rupert Grint and Georgia Groome are delighted to confirm the birth of their baby girl," a rep for the couple told PEOPLE in a statement at the time.