Talking to US Weekly, the country singer revealed that the couple are "calmer" now than when they were single.
"We learned to grow up and settle down. We're calmer now. We still have a blast, but in a different way. I mean, we lie there watching the Weather Channel!" she explained.
Lambert also praised Shelton's sense of humour, which she described as his best quality, saying: "It's not a front that he puts on. He is just the happiest person you'll ever meet. He literally waits to laugh and looks for a reason to smile. It rubs off on everyone around him."
The pair announced their engagement in May 2010 and married one year later in May 2011.
Lambert has previously confessed that she didn't initially know how to handle her intense connection with Shelton.
Watch the video for Miranda Lambert's 'Only Prettier' below: