Teigen and fiancé John Legend are having separate parties this weekend

By Susannah Guthrie
Updated August 22, 2013 07:00 AM
Courtesy Skittles

For her last blast as an unmarried woman, Chrissy Teigen is favoring health and relaxation over wild partying.

The fiancée of John Legend will be saying farewell to her single status with a big girls’ trip to Mexico.

“It’s going to be hilarious,” the model and Model Employee host told PEOPLE behind the scenes of her Skittles prank in New York City (see the video below). “I’ve never been to a bachelorette party! It’s my first girls’ trip, too!”

Despite the temptation to go crazy, the svelte beauty says she is planning on sticking to her pre-wedding regime.

“I’m like, ‘Please let’s try and be healthy!’ That’s the worst part. I have to book Pilates classes. I don’t work out on normal vacations.”

What else is in? “We’re doing cooking classes,” she says. What’s out? “No penis things! It’s embarrassing!”

Otherwise the 27-year-old is reasonably relaxed about the trip – and that Legend is doing his party at the same time.

“I wanted to make it the same weekend so I wouldn’t sit at home being like, ‘What’s happening?’ ”

Her husband-to-be, meanwhile, has a much more laid-back attitude.

“[John] doesn’t get jealous at all,” Teigen says. “So it makes me seem extra crazy.”