Alicia Silverstone Says Christian Siriano's Clothes Make Her Feel 'Very Much Like a Woman'

"He seems to really understand our bodies so well," the 'Clueless' star said of the designer at his NYFW runway show on Friday

Alicia Silverstone is singing designer Christian Siriano's praises.

The Clueless star, 46, raved about the designer, 37, while chatting with PEOPLE at Siriano's star-studded New York Fashion Week runway show on Friday. She shared that when she first started wearing the Project Runway alum's clothes, she found herself embracing her femininity.

"They just make me feel very much like a woman — a sophisticated but still sexy woman," Silverstone said of Siriano's elegant designs. "And he seems to really understand our bodies so well, and I think that's really what he did for me."

For his latest show at the Pierre Hotel, Siriano dressed Silverstone in a knock-out black dress featuring a sheer fabric decorated with flower appliqués in artful clusters. "He did it — it's all him," the actress said of her stunning look. "We had a few [dresses] to choose from but this felt … I don't know, it was really hard to choose."

Related: Christian Siriano: Redesigning Iconic Yellow 'Clueless' Suit for Alicia Silverstone was a 'Full-Circle Moment'

Over the years, the Senior Year star has become not only a client but a close friend to Siriano, and it seems the two like to get up to some fashion fun when they travel together.

"I think the most fun stuff is when we're on vacation," Silverstone revealed. "He'll just pull out some insane garment and put it on me. He'll do my hair, he'll start messing with my boobs. It takes him about five minutes and then you get these amazing photographs."

She added, "He's good at everything. He's a great photographer, great at hair and the clothes."

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In June, the pair treated fans to a glimpse of one of those vacation dress-up moments. Siriano shared a series of photos on Instagram of The Baby-Sitters Club star modeling a dramatic peach-colored ball gown while they were enjoying a getaway in Italy. In one image, Silverstone posed on the floor by some colorful stained glass windows with the dress' ruffly skirt fanned out around her.

"Sometimes you just need pink gowns in Como with Alicia Silverstone! 💞" Siriano wrote in the post's caption.

He also shared a light-hearted clip on his Instagram Story of Silverstone struggling to walk through a door in the voluminous dress.

The duo previously teamed up to recreate an iconic scene from Clueless for a TikTok video in 2021. In the clip, Silverstone reprised her role as teenager Cher Horowitz to reimagine the moment in the 1995 rom-com when Cher tries — and fails — to seduce her crush, also named Christian, played by Siriano.

"I finally got Christian in bed," Silverstone joked in the caption. "Happy #FridayThe13th #Clueless @christiansiriano."

Related: Janet Jackson Rocks Glossy, Monochromatic Look at Christian Siriano's NYFW Show as Sia Gives Surprise Performance

In addition to Silverstone, a bevy of celebrities filled the front row as Siriano debuted his latest collection on Friday — and celebrated his brand's 15th anniversary. Among the stars were Avril Lavigne, Laverne Cox, Padma Lakshmi, Janet Jackson and Sarah Hyland. Sia also did a surprise performance at the show, singing her hits “Chandelier” and “Diamonds” while clad in an over-the-top pink tulle gown and wig adorned with a large bow.

“Tonight was unbelievable!!" Siriano wrote on Instagram after the event. "Sia performed, Janet showed up, and wow thank you to everyone for all the support! 15 years wow! More to come!”

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