'19 Kids & Counting' Star Jill Duggar and Derick Dillard Reveal Proposal Details

April 9, 2014 -- When Derick Dillard decided to propose to "19 Kids & Counting" star Jill Duggar, he knew he wanted it to be special.

So special, in fact, that it took months to plan.

Derick, 25, told ABC News that he asked Jill's father, Jim Bob, for her hand in marriage back in February, and then contacted a singer/songwriter to help him write a song about his relationship with Jill.

After it was finished, Derick planned a romantic afternoon for them.

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"We went on lunch date to a Mexican restaurant and then we walked around in a park setting and the guy who wrote the song was just sitting on a park bench, nothing out of the ordinary," he said, adding that the couple's two chaperones stood back as they walked through the park. "He was like, 'Oh, hey, you look like a nice couple. I think I have a song for you guys.'"

Right away, Jill said she knew something was amiss, as the lyrics were so clearly about them. The giveaway, she said, was the reference to meeting from 8,000 miles away, as the first time they spoke, Derick was in Nepal and she was at home in Arkansas.

Still, she said, she did not realize a proposal was coming.

Then, "he said, 'When God made you, he was thinking of me,' and then at the very end [of the song], he said something about, 'And I pray that you think that too, when God made you he was thinking of me,' and I was like, 'That sounds like a question!'" she said. "After that Derick started saying a bunch of mushy stuff like, 'I love you so much,' and I don't remember everything!"

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After Derick proposed (yes, he got down on one knee!), he presented Jill with a ring he got for her in Israel.

"It's just a white gold band with a solitaire diamond: a round stone, .63 carats," Derick explained. "Jill really likes Israel and I'd always wanted to go to the holy land. ... [When I was there] I had it in my head that I wanted to get an engagement ring pretty soon but I had no idea it would work out [this] perfectly!"

The couple is now hard at work planning their wedding, which has been slated for this summer.

"I think it'll probably be a Duggar-sized wedding with lots of friends and lots of family, and everything centered on God," she said. "We're looking forward to it!"