Video! Rosie's 'Gaydar Was Way Off' with New GF

Talk show host Rosie O'Donnell revealed when she first saw her new girlfriend, Michelle Rounds, at a Starbucks, "I thought she was a 28-year-old heterosexual girl, because that's what she looked like to me. [But] she's a 40-year-old gay woman."

In a recent sit-down with Nightline correspondent Cynthia McFadden, O'Donnell laughed, "My gaydar was way off."

Rosie continued, "But if I think if I had known that she was gay, I wouldn't have been brave enough to talk to her."

Rosie, whose marriage to longtime partner Kelli Carpenter ended in 2009, said Rounds, who works in corporate placement in NYC, caught her attention. "She was holding a little puppy and I was about to get another puppy for Chels (her daughter Chelsea)."

The 49-year-old comedian is gearing up for her return to television in "The Rosie Show," set to air on Oct. 10 on OWN.