Matt Bellamy wishes someone had warned him how "horrible" births are.

The Muse frontman was present when his fiancee Kate Hudson delivered their son Bingham in July, but he wasn't prepared for just how gory it would be: "I don't understand why no one had warned me about how horrible it would be. The baby's head was weirdly elongated when it came out. That freaked me out a bit."

When he and Kate first took Bingham home, the rocker admits he was "petrified" about his new fatherly responsibilities, but he quickly bonded with his baby and learned what to do. "I had to learn how to change nappies. It took a while before I got used to it. First I was petrified - I couldn't believe what was happening. You're in this kind of bubble where everything feels really far away. Then you just concentrate on the easy stuff - which I'm not very good at to be honest. But somehow nature makes sure you grow into your role as a father."

Matt, 34, admits nothing has given him as much satisfaction in his life than fatherhood and the love he has for Bingham is limitless: "I met Kate and fell in love with her. But the best thing that has happened to me since was becoming a father. Being a father changes so much: the way you look at the world and yourself. There's nothing that's as much fun as a baby - it's endless joy. I'm really happy with everything."

Matt has been dating Bride Wars actress Kate - who also has an eight-year-old son Ryder with her ex-husband, The Black Crowes singer Chris Robinson - since 2010 and they got engaged in April 2011.