01/09/2012 06:34 pm ET

Jennifer Hudson Engaged: Singer Opens Up About Her Fiance (VIDEO)

Singer and actress Jennifer Hudson stopped by NBC's Dateline on Sunday night to discuss her new book, "I Got This: How I Changed My Ways and Lost What Weighed Me Down," which hits bookstores Tuesday.

In addition to dishing on details of her journey to fame as well as her battle with weight loss, Hudson opened up about her fiance David Otunga -- and how he proposed over three years ago.

"I remember him telling me, 'Put on your favorite dress,'" said the Grammy Award winner, who has a two-year-old son with Otunga.

The Harvard Law graduate and WWE wrestler popped the question on a beach in Malibu, Calif. on Hudson's 27th birthday in September 2008, less than a year after the couple began dating.

"He had birthday cards, and each card threw another hint and another hint and another hint," said Hudson. "And I got to the last one, and it said when you're done reading this card, I want you to turn around and I have a birthday gift for you."

When Hudson turned around, Otunga was on one knee -- proposing with a gorgeous Neil Lane diamond ring.

Hudson told Dateline that the couple has finally set a date for their nuptials, but hasn't revealed exactly when the wedding will take place.