However, this Valentine's Day apparently won't be much different for the 49-year-old reality TV star and writer than in years past.
"I haven't celebrated Valentine's Day since the fifth grade when the boy I had a crush on gave me a valentine, only to find out later that he gave one to the entire class, including the boys," she joked.
Radziwill joined the cast of The Real Housewives of New York City for its fifth season in 2011. Irwin, 43, reportedly appeared in a few episodes of the series and the couple had even recorded a song called "Manhattan" together.
Radziwill's late husband Anthony died from cancer in 1999.
DISCUSS AND COMMENT ON THIS STORY Reality TV World now offers Facebook Comments on our stories. To post a comment, log into Facebook and then 'Add' your comment. To report spam or abuse, click the 'X' in the upper right corner of the comment box. Get more Reality TV World! Follow us on Twitter, like us on Facebook or add our RSS feed.