Mahoney popped the question during the weekend, "Access Hollywood" reported Friday. The couple have been dating for seven months.
"The happy couple have not set a date for the wedding yet," a Cross spokesman told the TV celebrity news show.
This will be the first marriage for Cross, best known as ABC's housewife Bree Van De Kamp and crazed Dr. Kimberly Shaw on FOX TV's 1980s hit, "Melrose Place."
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