The WAG has all ooohing and ahhhing after posting the most adorable pictures of the brothers in matching pyjamas on Twitter.
Three-year-old Kai can be seen cuddling up to his baby bro in their stripy pirate PJs as they get ready for bed.
Coleen and Wayne welcomed their second child Klay back in May.
Announcing the news on Twitter, Coleen wrote at the time: "At 2.11am our Beautiful Son... Klay Anthony Rooney entered the world. He weighed 7lb 11 1/2 oz. We're all so happy and doing well. X"
The couple, both 27, married on 12 June 2008 after meeting at secondary school.