The couple have been dating since August 2011, and although they have had their ups and downs, Taylor claims it's a case of opposites attract.
"I'm reserved, she's not. For whatever reason, it works. It works and that's that," the Chicago Fire actor told E! News.
On Sunday, the couple made a rare public appearance together, and were seen kissing and cuddling at the NBC Golden Globes afterparty in Beverly Hills.
Taylor, 32, has previously said he is ready to settle down and start a family with the 27-year-old superstar.
"I do want to give mom grandchildren, of course," he said. "I think I'd be a good dad, it would be a pleasure. I'd love it - and I'm in my 30s now.
"My mom wants me to get married and have children, of course.
"She's met Gaga, we've been dating for a while, we're in a committed relationship and I'm really happy in my relationship. I'm a very lucky guy."
Lady Gaga - real name Stefani Germanotta - has already said she wants to have at least three children.
"I want to have a ton of kids, actually," she revealed. "I think at least three. I really want to have a family and I really want to nurture my children."