Jenner, 66, tries on dresses with her close friend Candis Cayne on Sunday's upcoming episode

By Aurelie Corinthios
April 06, 2016 01:50 PM

It’s been almost a year since Caitlyn Jenner made her public debut as a woman, but she’s still experiencing milestones in her journey every day.

In a sneak peek at Sunday’s upcoming episode of I Am Cait, the reality star and her squad stop by a bridal boutique to try on wedding dresses.

Candis Cayne tries on the first gown, but Jenner, 66, steals the show when she comes out in a stunning white lace dress with a sweetheart neckline and delicate sleeves.

“How do they do the walk?” she asks, taking a step forward while the rest of the women ooh and aah.

She finally turns to the mirror and catches her first glimpse at herself, letting out a shriek: “Oh my God!”

“What do you think?” she asks her pals.

“That is flipping stunning,” says Ella Giselle.

“I think we need to pose!” Jenner tells Cayne, and the two women step up on their own stand to show off the gowns.

“Thank you, Chandi,” Jenner says to pal Chandi Moore while she adjusts her train. “You can be my bridesmaid any day!”

RELATED VIDEO: The Caitlyn Jenner Story: From Olympic Icon to Transgender Hero

In an on-camera interview, Jenner opens up about how special the moment is to her.

“Did I ever think this day would come? No. I’ve been in three weddings with the most boring clothes on in life, okay?” she says, referencing her previous marriages as Bruce Jenner to ex-wives Chrystie Scott, Linda Thompson and Kris Jenner.

“Finally, I get to wear something comfortable,” she adds happily.

“Candis and Caitlyn, I now pronounce you trans bride and trans bride!” one of the women tells Jenner and Cayne, as the group cheers them on excitedly while they embrace.

I Am Cait airs Sundays (9 p.m. ET) on E!