Lili Reinhart Wore Vintage Emanuel Ungaro on The Tonight Show Starring Jimmy Fallon

Lili Reinhart kept her vintage-dressing streak going strong with her latest talk show stop. The "Riverdale" alum and "Hustlers" actress appeared on "The Tonight Show Starring Jimmy Fallon" on September 17 to promote her new film "The Love Hypothesis," and once again pulled from fashion's archives for the occasion.

Lili wore a 2000s-era Emanuel Ungaro dress featuring thin spaghetti straps and a deep plunging neckline that led into a fitted, bias-cut bodice. The gown was covered edge to edge in swirling paisley and floral patchwork patterns, mixing bright lime, lilac, black, and pink tones across the fabric in a bold, maximalist print. The bodice's fitted shape flowed into a slim, floor-length skirt that skimmed her frame all the way down, giving the piece a bohemian-meets-glamour feel true to Ungaro's signature style.

She paired the dress with Paris Texas's Lidia Leather Sandals, priced at $745, a black strappy heel that kept the focus on the dress's colorful print. Lili wore her blonde hair down in soft, loose waves parted deeply to one side, and kept her makeup warm and glowing with a glossy pink lip.

This marks yet another archival fashion moment for Lili during her "The Love Hypothesis" press run, she's leaned heavily on vintage pieces throughout the tour, including a rare Emanuel Ungaro Spring 2001 runway slip dress at the film's New York premiere and an archival Elie Saab Spring 2004 Couture gown for another red carpet stop. Between the talk show circuit and her ongoing string of throwback fashion picks, Lili's promotional run has turned into as much of a style moment as a film rollout. "The Love Hypothesis," also starring Tom Bateman, hits Prime Video on September 23.