Rosie O'Donnell Got Engaged "a Few Months Ago"

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When you know, you know!

Rosie O'Donnell surprised fans on Monday when she announced that she and girlfriend Michelle Rounds were getting married over the Christmas holiday.

But it turns out that O'Donnell moved even faster than that to snag her bride!

O'Donnell, 49, explained on The Rosie Show Tuesday that she and NYC headhunter Rounds got engaged "a few months ago." The comic andRounds went public with their romance in September.

"Michelle said to me a few months ago, when we got engaged, she said, 'How come you didn't say it on your show?' And I was like, 'Honey, I don't know how.' I didn't know how to say it," O'Donnell evealed Tuesday on OWN's The Rosie Show.

O'Donnell -- who came out of the closet as a lesbian years after becoming a star -- admitted she's not that comfortable discussing her love life with the public.

"You don't want to become one of those celebrities that talks about their relationship ad nauseum and makes it into a fairy-tale thing," she added. "And then they go and have an affair with somebody...I don't want to say any names."