How Dolly Parton keeps her romance alive with husband Carl Dean after more than 50 years

Dolly Parton has revealed the secret to her long-lasting marriage with her husband, Carl Dean.

The iconic country singer, who has been married to Dean for almost 56 years, opened up about keeping the romance alive — revealing it's the "little" things they do for each other that matter most.

"You find little ways," Parton, 76, told Us Weekly while promoting her new Dolly Parton x Duncan Hines line ahead of its launch in March.

READ MORE: The story behind Dolly Parton's 'mystery' husband

"Like last year on his birthday, I dressed up in my Playboy bunny suit, made him breakfast and [ran] around in that for a little while."

The 'Jolene' singer went on to share some thoughtful relationship advice, explaining that couples shouldn't complain about the "stuff that ain't important."

"You know, most people can keep a marriage [going strong] if you make a little effort," she added. "Some people just get slouching and lazy and about stuff that ain't important, like leaving the toilet seat up. And if that's the worst thing you've to worry about, you're already in trouble."

Parton and Dean, 79, tied the knot in May 1966 after meeting outside their local laundromat in Nashville in 1964. She was 18 and he was 21 when they married.

READ MORE: Janet Jackson breaks silence on Justin Timberlake Super Bowl 'wardrobe malfunction' for the first time in 18 years

Despite the '9 to 5' songstress skyrocketing to global fame during their relationship, they have been going strong ever since.

"We're the perfect partners," she told Us Weekly. "We both have great sense of humour…"

"We're able to, like, solve any problems and any situation, making a joke about it and not letting it get too heavy, but we respect each other and we like each other," she continued. "We lucked up, let's put it that way."

Parton also hinted at her Valentine's Day plans for this year, saying she'll dress up in "some little fun" outfit and shower Dean in presents.

"I always wear some heart-shaped something and I always get him several Valentine's cards," Parton revealed. "You know, cause when you start looking for cards, you find so many and you want 'em all."