While younger brother Nick might be testing out a solo career this January, the eldest Jonas, Kevin will embark on a lifetime duet this weekend.

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RadarOnline.com has the exclusive details about his upcoming wedding to Danielle Deleasa!

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Kevin and Danielle - who met in the Bahamas in 2007 while on vacation with their families- will tie the knot amidst family and friends at a castle on Long Island, the Oheka Castle. That's the same place where 'N Sync's Joey Fatone tied the knot in 2004.

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The wedding rehearsal will be held on Friday (and will include a roller skating rink!) and the wedding will occur on Saturday. RadarOnline.com can also confirm that long-time friend Demi Lovato- who has been rumored to be having a secret romance with Joe and has toured with the brothers- is expected to be one of the guests.

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As for the menu, guests will have a wide range of choices including filet mignon, sea bass, chicken and a vegetable tart.

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Deleasa is a former hairdresser in New Jersey and got the surprise of her life in July when Kevin showed up at her doorstep in the early morning hours and dropped to his knee to ask her to marry him. Having flown on a red eye after a concert in Vancouver, Kevin also brought with him a custom-made cushion-cut diamond ring he designed with Jacob & Co.

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At the time, younger brothers Nick and Joe congratulated their soon-to-be sister-in-law on their Twitter page: "Congrats big brother.....Dani welcome to the family, we can't wait to have you join us on the road!"

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