Kevin Jonas, the eldest member of the hit music group The Jonas Brothers, is now officially engaged. He proposed to his girlfriend, Danielle Deleasa, last week with a one-of-a-kind platinum ring. The 21-year-old pop star, currently touring in Canada, reportedly took an impromptu flight back home to New Jersey, surprising Deleasa at her home. The hefty ring features a 3-carat cushion-cut diamond surrounded by 210 round brilliant-cut diamonds weighing in at 0.72 carats.