DeAnna Pappas and a "Bachelor" co-star, Holly Durst, are engaged -- to twins, the new issue of Us Weekly reports!

Pappas, 28, and Durst, 27, who were contestants on separate seasons of the ABC reality hit, met their fiances, Stephen and Michael Stagliano, 26, at a party for 2009's "The Bachelorette: The Men Tell All" special.

Stephen popped the question to Pappas, who starred on season 4 of "The Bachelorette" and split from fiance Jesse Csincsak in 2008, last May with a 2.12-carat ring.

"I was crying, holding his hands, and he showed me the ring. I just nodded, like, 'Yeah!'" Pappas tells Us.

Michael, who was on season 5 of "The Bachelorette," proposed on June 26 at Durst's parents' lake home in Doylestown, Ohio.

"I did it at sunset on a dock with a gazebo. I used fishing line to hang 55 fake engagement rings from the roof," he tells Us. After offering her five fake rings to represent different relationship memories, he presented her with a 1.66-carat princess-cut ring from Boston's King Jewelers.

"I was like, 'Put the ring on!'" says Durst, who was on season 12. Jokes her fiance, "I was kind of like, 'Did you say yes?'"

Now, the group is planning a double wedding for next spring -- which may be featured on a reality show called "Four Better, for Worse."

"We're going to compromise on the wedding style. Holly's very girlie, pink and pearls," says Pappas. Adds Durst, "DeAnna likes fall colors: browns and oranges."

One thing they agree on: The big day will be "humongous!" says Stephen. "There are three families. Lots of Pappases," quips Pappas.

To find out all their "I Do" details -- including what they want their dresses to look like ("We're obsessed with Monique Lhuillier!" says Pappas) and which Bachelor guests will be there -- pick up the new issue of Us Weekly today!

See more photos of DeAnna here!