The 'God Gave Me You' hitmaker adores spending time with his partner's three sons Kingston, 11, Zuma, nine, and Apollo, four - who Gwen has with her ex-husband Gavin Rossdale - but it has made him realise what he had forfeited by not having children of his own.
He told The Today Show: ''At this point in my life, I kind of had put [having kids] as like, 'Well, that wasn't meant to be.' Then all of a sudden it happens one way or another and it's like, 'Wow, I missed out on a lot.' And so having them around ... I don't even know how to describe it. It's so much fun.''
Meanwhile, Blake previously revealed he is ''in love'' with Gwen's three children but admits it was ''awkward'' getting to know them at first.
He said: ''For a long time, it was awkward trying to figure out what my place is and in their mind too. The best part for me, selfishly, is discovering a part of myself that I guess I never really knew was in there. It's definitely an instinct that kind of kicks in.
''There's days where you go, 'Oh my God, when does school start?' An hour later you're going, 'God, I can't wait 'til they get home.' They're so damn funny. It's just my first time being around it, and it's easy to fall in love with those kids. They're special.''