Before they walk down the aisle next weekend, former Bachelorette winner Jesse Csincsak and his expectant fiancée Ann Lueders are planning a special rehearsal dinner for those closest to them – including fellow Bachelor and Bachelorette alums.

“We are really excited about celebrating our last “single” night with our family and friends,” Csincsak, 28, tells PEOPLE.

The bash, to be held at Las Vegas’s Rumor Hotel, will be a poolside barbeque for 75 people – with a customized menu. “Chef Vic Vegas did exactly what we wanted,” Csincsak says. “He prepared a fun, simple menu for people that like to eat. Nothing fancy or outrageous.”

What will guests be eatin? To start, there will be a Peruvian purple potato salad, tortellini pasta pesto salad and an arugula, strawberry and Gorgonzola salad. In keeping with the barbeque theme, guests will also be served corn on the cob, Jalapeño corn muffins, and more.

The entrees are all about meat: shredded BBQ short ribs, a grill station, Jamaican jerked honey chicken, Italian sausages with peppers and onions – and Guinness braised brats with sauerkraut.

And with Leuders, 28, four months pregnant, will all the delicious food – including a dessert of strawberry Twinkie shortcake – throw her off course when it comes to slipping on her wedding dress?

“I’m not really showing very much – so I have my fingers crossed just making sure the dress still fits because I really haven’t gained too much weight,” she says. “I think I’ve gained four pounds, total.”

“The dress is still the same one I originally picked out,” Leuders says, “and then it’s just a matter of making sure we don’t have to let it out much at all.”

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