The 'Love Me Now' singer has teamed up with Ariana Grande to record the titular theme song for the live-action remake of the classic tale and he and his wife are looking forward to the day when 10-month-old Luna is old enough to see the movie and understand her dad's contribution.
John said: ''She hasn't sat through a movie yet, but it'll come soon. And she'll be so proud of Daddy.''
Chrissy - who is ''obsessed'' with the song and has even been teaching herself how to play it - added: ''I think it's such a beautiful melody.
''I'm so excited that Luna gets to hear it one day when she really realises who's singing it. I'm really excited.''
John and Ariana were very excited to cover the track, which was originally recorded by Celine Dion and Peabo Bryson, but the 38-year-old singer admitted he was ''nervous'' about the 'Think Twice' singer's reaction to their version.
He told 'Entertainment Tonight': ''We were happy to do this song. We grew up with the song. It's such an iconic original film [and] song, and for us to be able to recreate it, it's been fun.
''I'm a little nervous [about what Celine thinks]. She's very sweet and I hope she likes it.''
But Chrissy, 31, doesn't think her spouse has anything to worry about.
She said: ''She's the sweetest human on the planet about it, of course. She doesn't have a bad word in her body, she's so incredible.''
Happily for John, Celine has already given the track her seal of approval.
Asked what she thought of the duet, she said recently: ''I can't refuse that. I'm so proud.''
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