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Kevin Jonas is likely wedding fiancee Danielle Deleasa this winter, his brother Nick has revealed.

"They have not set a date yet, but I think that it'll be sometime around the end of the year, beginning of the year -- something like that," he told ABC News Radio on Monday.

Kevin, 21, popped the question to Deleasa, 22, in July at her New Jersey home.

Nick, 16, said he and brother Joe, 19, weren't surprised.

"Kevin and Danielle were on the beach walking, and Joe was like, 'Oh, they're gonna get married,'" he said. "And then, a couple years later, they were engaged and now we're here."

Nick said he doesn't know if he or Joe will serve as best man to Kevin.

"We've talked about it a little bit," he said. "He's working it all out, but we'll see what happens. I'm happy for them and we love her, and we're happy to have her as part of the family."

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