The couple exchanged vows on Wednesday, and the "Right Here Waiting" hitmaker broke the news to fans on Instagram, reported Entertainment Tonight.
Sharing wedding photos of himself and his new bride, he wrote, "On December 23rd, 2015 the magnificent @daisyfuentes gave me the honour of becoming my wife."
Fuentes, 49, added, "This happened & I couldn't be happier."
Marx started dating Fuentes, who appeared in his video for "Beautiful Goodbye", at the end of 2014.
Marx split from Cynthia Rhodes, his wife of 25 years, in April, 2014, while Fuentes was married to actor and model Timothy Adams from 1991 to 1995. She also dated singer Luis Miguel and was previously engaged to former Bros star Matt Goss.
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