(PEOPLE.com) -- Rosie O'Donnell was attracted to Michelle Rounds the moment she saw her in a Starbucks this summer. But she never thought it would be reciprocated.





"I thought she was a 28-year-old heterosexual girl, because that's what she looked like to me. And she's a 40-year-old gay woman," O'Donnell, 49, tells ABC's "Nightline" in an interview airing Monday night.





She adds with a laugh: "My gaydar was way off!"





RELATED: Rosie O'Donnell: 'I've Stopped Being So Angry'





But O'Donnell, who recently said she's in love, thinks maybe it's a good thing she thought Rounds was straight. "I think if I had known that she was gay, I wouldn't have been brave enough to talk to her," she says.





O'Donnell's new nightly talk show, "The Rosie Show," debuts Monday on the OWN network.





See full article at PEOPLE.com.





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