Yeah, we were kind of surprised too, but Simon probably has a shiny new outlook on fatherhood now that he has a little one of his own.
Simon told Good Morning Britain that he's already passed on some fatherly wisdom to Louis, explaining, "I just said enjoy it. If I had been his age and someone had said you're going to have a baby, I'm not sure how I would have coped with it."
He added, "But he did call me and I said when you've embraced it, you'll be amazed how much you are going to love it. It will change your life for the better."
Wow, right? Grumpy old Simon has softened now that he's a dad.