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Details on the engagement weren't immediately available. Moore, 24, and Adams, 34, had dated off-and-on since March 2008.
Moore, who supported close pal and ex-boyfriend DJ AM in the wake of his plane crash, has also been linked to musician Greg Laswell, tennis star Andy Roddick, and actors Zach Braff and Wilmer Valderrama.
Adams, a singer, songwriter, producer and author, is best known for his song "New York, New York." Moore's next album, Amanda Leigh – a follow-up to 2007's Wild Hope – will be released May 26.
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