The 46-year-old singer, who has been married to the actress, also 46, for seven years and has two children with her, Sunday Rose, five, and Faith Margaret, three, credits her for helping him find the time to fit his busy career around his personal commitments.
Speaking on the red carpet before the Academy of Country Music Awards in Las Vegas last night (06.04.14), he said: '' I always give props to Nic. Because we travel so much as a family, she does an amazing job keeping everybody together.
''She's got the kids' schedule dialed in, she's dropping them off even in the middle of her work. I couldn't do any of this without her.''
In order to make their busy schedules work, the family try to fit in fun around their career commitments.
The 'American Idol' judge explained to People: ''Trying to block out time never seems to work. So if she's shooting a film - she was in Morocco, so we're like, 'OK, we're gonna go to Morocco for a holiday'. We just kind of had one while she was working.''
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The BBC drama starring Aidan Turner returns to BBC One on September 4th.
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After having a music career that spanned five decades and saw the release of over...