September 05, 2014 - 15:31 BST hellomagazine.com The Girls Aloud singer has become a mum for the first time with partner Justin Scott Kimberley Walsh and her partner of ten years Justin Scott are overjoyed after the birth of their baby boy, named Bobby. Their son was delivered Thursday 4 September and the former Girls Aloud star announced the happy news on Twitter, telling followers: "Our beautiful baby boy Bobby arrived yesterday afternoon 04/09/14 he's perfect" Our beautiful baby boy Bobby arrived yesterday afternoon 04/09/14 he's perfect 😍👶🍼 — Kimberley Walsh (@KimberleyJWalsh) September 5, 2014 Her bandmates wasted no time in sending their congratulations. Cheryl Fernandez-Versini replied to Kimberley's tweet with: "He really is, he's perfect!" while her tweet included lots of smiley face emojis. Nicola Roberts also became involved in the conversation adding: "I can't believe he's here". @KimberleyJWalsh He really is 😭😍😍😍😍😍 he's perfect ! ❤️👶👼🍼 — Cheryl (@CherylOfficial) September 5, 2014 @CherylOfficial @KimberleyJWalsh he is ❤️❤️❤️ and I can't believe he's here 👼 I'm 😭 too 👼👼👼 — Nicola Roberts (@NicolaRoberts) September 5, 2014 Kimberley first let on that she was expecting in February, describing the news as "crazy”. “I can’t believe I’m actually going to be a mother and there’s this thing inside me, waving its hands around and wriggling. I’m so excited," she said. "I feel like I’ve had to live in a selfish way for too long and now I’m looking forward to giving that up for somebody else.” The pregnancy wasn't without incident. In March she was forced to reassure fans that her "little munchkin" was fine after falling and breaking her wrist.