A cheep slut has come between a hawk and her hubby.

For the last five years, two red-tailed hawks named Christo and Dora have ruled the roost at Tompkins Square Park, mating and raising 10 chicks together.

But three months ago, Dora had to leave and go to rehab for an injured wing. And while hawks usually mate for life, an opportunistic bachelorette named Nora soon arrived and began flapping her feathers at Christo.

“She swooped in the second Dora left,” said Laura Goggin, 36, who’s been documenting the tryst on her blog.

To some bird watchers, Nora is nothing more than a rust-colored nest-wrecker.

“It put a bad taste in our mouths to see him with a mistress,” said local Helen Stratford, 60, who has watched the avian affair unfold with a heavy heart.

While Dora recovered from a bone infection in her left wing, Christo even invited Nora to spend time in his and Dora’s nest, Goggin said.

“He kept trying to get Nora interested in the nest and calling out to her, but she preferred to mate away from Dora’s territory,” said Goggin.

On Monday, the soaring soap opera reached its crescendo — Dora returned.

The three lovers met beak-to-beak in the center of the park, where the plumage hit the fan.

“The three of them flew around each other screaming,” said Goggin. “It was chaos.”

‘My heart sank knowing Dora saw Christo taking up with another female’

Moments later, Christo and Nora dashed off together.

“My heart sank knowing Dora saw Christo taking up with another female,” said Goggin.

It turns out Christo might be doing double time as a Don Juan.

Every morning since Tuesday, bird watchers have spotted the golden-headed hawk bringing Dora sticks to help weave into her tree nest near East 8th Street and Avenue B. He also leaves her dead rats to feast on.

Then, in the afternoon, Christo flies back to Nora — who prefers to nest around the Jacob Riis Houses on Avenue D between East 10th and East 13th Streets — to mate.

“He went from monogamist to polygamist!” Stratford said.

Though red-tailed hawks normally stick together forever, it’s normal for New York City hawks to find a new mate within 24 hours if one of them dies, said Bobby Horvath, a wildlife rehabilitator who nursed Dora back to health.

He said threesomes are rare but possible.

“There have been prior documented cases where it has worked out,” said Horvath. “As long as the females are kept apart.”

Locals are confident Christo is up to the task.

“He’s a really stand-up hawk and father,” said Stratford. “If anyone can make it happen, it’s him.”