The clip is less than a minute, but it shows never-seen-before footage of Wade, 32, getting down on one knee and the couple celebrating the engagement with Wade's kids -- Zaire and Zion -- and his nephew, Dahveon. The Miami Heat star and Union, 41, got engaged this past December.
Union, who couldn't look more excited, even gives her new fiancé a high-five in the video.
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Guests will have to keep the weekend of Aug. 30 open for the couple's Miami wedding.
Check out the video for yourself below. TMZ was the first to release it.