She shared the news on Instagram, captioning the post: "Introducing Rudy Hazel Blake. Or, as she's known in hip-hop circles, the Notorious RHB. Or, as she's known to her brother, Blobby The Sister."
Hamish has also shared a snap of Sonny's new little sister.
"Admitting another patron into the nightclub my wife and I run (I'm security, she's the DJ)," he wrote. "We have a fairly strict door policy as you have to be a child of the DJ and/or bouncer, so it's always great to get someone new through the door. The photo copy I took of her license says her name is Rudy Hazel Blake and I'm just about to tell her it's a $12 cover charge. Nah, just messing with you Rudy, babies drink for free and you're cute as hell. Free entry."