The CSI: New York star proposed to his girlfriend of two years, Abigail Ochse, with a vintage-style ring designed by Dan Wexler on New Year's Eve (31Dec12), during a family vacation in Hawaii.
And Buckley made sure his father, who died of pancreatic cancer last year (11), got the chance to be a part of his special moment.
A source tells Life & Style magazine, "A.J. proposed to Abigail in front of his mum, Patricia, Abby's sister, Alicia, and a group of close friends in Hawaii on Dec. 31.
"He got down on one knee and asked Abby under a tree in Turtle Bay, Napili, where they had left some of his father's ashes in 2011."