John Shearer / WireImage 1 / 8
John Shearer / WireImage 1 / 8

Claire Danes is finally opening up about her affair with Billy Crudup.

The "Homeland" star and the "Almost Famous" actor memorably fell in love in fall 2003 on set of their film "Stage Beauty" -- while Danes was still in a relationship with "Catch My Disease" singer-songwriter Ben Lee and Crudup's girlfriend of eight years, Mary-Louise Parker, was seven months pregnant with their first child together.

Their off-screen dalliance, which effectively ended Danes' relationship with Lee and Crudup's with Parker, lasted for three years until -- in a case of "what goes around comes around" -- Danes left Crudup for now-husband Hugh Dancy.

Now, almost a decade after they parted ways in 2006, the Emmy winner has shed some light on what it was like for her to suddenly find herself at the center of a very public breakup between a beloved actor and his pregnant partner.

"That was a scary thing. That was really hard," Danes said of the judgment she faced in the wake of her budding romance with Crudup during an appearance on Howard Stern's SiriusXM radio show on Oct. 5.

"I didn't know how to not do that," she added. "I was just was in love with him and needed to explore that and was 24 and didn't quite know what those consequences might be."

And she's not exactly beating herself up over her romantic faux pas: "It's okay," she says. "I went through it."

Perhaps it's the public outrage they once weathered as a couple that's helped Danes and Crudup maintain a friendship almost 10 years after they called it quits: "We're still friendly. We're friends," the 36-year-old told Stern.

The "Homeland" actress and "Evening" co-star Hugh Dancy tied the knot in September 2009. They welcomed their son, Cyrus, in December 2012.

Crudup, meanwhile, has managed to keep his love life out of the headlines for most of the past decade, though his romantic foibles may be dragged back into the spotlight in November 2015 when Parker debuts her memoir, "Dear Mr. You," which will reportedly include letters dedicated to the men in her life. Presumably, Crudup, the father of her son William, will be among the "Weeds" star's featured former paramours!