Alyson Hannigan

We’re joining Alyson Hannigan as she shops for wedding gowns! Just one more episode before Lily weds Marshall on TV’s "How I Met Your Mother," and star ALYSON HANNIGAN — who also played Willow on "Buffy the Vampire Slayer" — is psyched to try on wedding dresses!

We joined Alyson as she visited the famed MONIQUE LHUILLIER bridal salon in Beverly Hills to give some of Monique’s gorgeous creations a test drive.

"It’s exciting!" Alyson says. "There’s so many beautiful dresses to choose from."

In real life, Alyson is married to actor ALEXIS DENISOF, whom she met when both starred on "Buffy." But Alyson was certainly game to slip on dresses handmade by Monique, who has dressed BRITNEY SPEARS and more celebs for their wedding days.

Ruffled gowns were all the rage at this month’s Bridal Fashion Show in New York, and the first dress Alyson tries on is made from delicate layers of chiffon.

"I want to sleep in this, it’s just so lovely!" she says.

Alyson also gets to model another popular trend, a strapless, empire-waisted dress with a gray silk taffeta ribbon just under the bustline.

"This is more of an empire silhouette, so it’s right up under the bustline," Monique explains. "It gives you a longer line."

Making the dress even more spectacular is the fact that it’s sprinkled with crystals and silk chiffon rosette flowers down the skirt.

"I think it’s amazing!" Alyson gushes. "It’s so very soft."

But she’s not done yet! There is still a princess-y gown with silver ribbons, beading, and even a bustle and train in the back!

"The back is always so important," Monique explains. "I always tell the brides, ’This is what your guests are going to see for 45 minutes during the ceremony.’"

So which dress did Alyson choose? Tune in to CBS at 8:30 p.m. on Monday, May 7th, and May 14th for the two-part wedding episodes of "How I Met Your Mother" to find out!