The 38-year-old hunk is in a "great place" since marrying Lively, reported Daily Mirror.
"I'm in a great place. I have a family and a little girl, and I honestly couldn't be happier right now. There's just no place I'd rather be, it's the ultimate trump card.
"It seems almost unbelievable that she's already a half-year old. That's why I want to make the most of this time in her life," he said.
And the 'Green Lantern' actor, who was previously married to "Lucy" star Scarlett Johansson and engaged to musician Alanis Morrisette, insisted he loves every part of parenthood, revealing he thinks getting up in the middle of the night to soothe his child is "the best thing in the world".