Rosie O'Donnell says her new love, Michelle Rounds, doesn't look gay.

In a new interview to air Monday night on ABC's Nightline, O'Donnell, 49, talks about meeting her girlfriend.

“I walked into a Starbucks in the summer and she was holding a little puppy,” O'Donnell said. “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.”

“My gaydar was way off!” she said with a laugh.

“I think if I had known that she was gay, I wouldn't have been brave enough to talk to her,” O'Donnell added. (The video is embedded in the right panel of this page.)

O'Donnell returns to television on Monday with a new nightly talk show on Oprah Winfrey's OWN cable network. The Rosie Show marks O'Donnell's long-anticipated return to television.

In March, O'Donnell, who came out gay in 2002 and shares 4 children with ex-wife Kelli Carpenter, told shock jock Howard Stern that she and former girlfriend Tracy Kachtick-Anders, an artist who is raising six children, had not split.

“We didn't really break up,” O'Donnell said. “She just has six kids … and I have four. It's insanity.”

Previously, O'Donnell had referred to her relationship with Kachtick-Anders as the Gay-dy Bunch: “Tracy has six kids, she lives next door … It's a lot! We're the Gay-dy Bunch! It's a challenge, but when you fall in love with someone, they come with a whole bunch of things, including children.”