Blake Shelton and Miranda Lambert reportedly split because she wasn't ready to have children.

The couple announced yesterday (20.07.15) they had separated after four years of marriage and it has now been claimed that they had different ideas on when to start a family.

A source said: ''He is eager to have children, but she really enjoys not being tied down. I think they both were off on what the time frame would be.''

And the insider claimed the 31-year-old beauty's more rigorous touring schedule kept the pair apart from long periods of time.

The source added to the New York Post newspaper's Page Six column: ''They are never together, and he was wanting them to move close to being together. She really loves her career and touring. She has the ability to go and record albums when she wants and to tour.''

Miranda - whose divorce from 39-year-old Blake was finalised just hours after they announced their separation - recently insisted spending so much time apart from 'The Voice' coach wasn't ''a big deal''.

She said in April: ''It's definitely a different way to live and to be in a relationship but I feel like our relationship started on going separate ways and we just made it work and we make sure that our time together really matters, so when we're apart, it's not really a big deal because we know when we're together, we're really together.''