Liam Payne and Cheryl Tweedy "work together" in "everything that [they] do".
The 24-year-old musician - who has five-month-old son Bear with the former Girls Aloud singer - has admitted the pair do everything together including listening to each other's songs and checking over photoshoots.
And Liam believes his music is in good hands with his 34-year-old beau, as her history as a judge on talent show 'X Factor' means she knows what to look out for.
He said: "She's across a lot of the stuff and I trust her opinion more than most. She's judged for a number of years on a great British TV show and had a phenomenal start with er solo career and breaking records. Whose ear are you going to trust wen you've got one at home?
"We play stuff to each other all the time and look at photoshoots. There is an essence of us working together in everything that we do."
The 'Strip That Down' hitmaker has also hinted that his upcoming debut solo record will contain a track dedicated to his girlfriend, because he is "inspired" by her.
Asked by The Sun on Sunday if he'll pen a track about Cheryl, he said: "It would be he ultimate romantic gift. There are different songs, when I'm singing them, that mean different things to me and the stuff that goes on in our lives. You're inspired by those you love and the things that have happened to you."
It isn't just their working lives which the couple helps one another with either, as Liam recently revealed they even do workouts together.
He said: "We have started to do workouts together. She has a system she does and it works very well for her. She's worked very hard for what she's got and it's an inspiration for everyone out there.
"She inspires me. I work out all the time - we're quite a fit family. We're very energetic so we have to find somewhere to diffuse that energy."