Harry Styles's Album Release Party Had a Stevie Nicks Surprise

LOS ANGELES -- Harry Styles had a surprise guest at his album release party.

None other than Stevie Nicks -- gay icon and Styles's childhood role model -- took the stage at the Forum in Los Angeles to sing a duet of "Landslide" with the former One Direction singer.

Nicks appeared during the encore performance of Styles's event. Beforehand, the 25-year-old heartthrob sang the entirety of his new second studio album, Fine Line, including songs "Lights Up," "Watermelon Sugar," and "Adore You."

Sartorial elements also took center stage. "Style is the answer to everything," Styles voiced at the beginning of the concert. The singer's outfit -- the same as pictured in his new album cover -- was its own star in the show. Evoking a gender-nonconforming '70s look, Styles wore high-waisted white bell-bottoms that were accentuated in length by a camera angle shot from below.

Styles, a longtime ally of the LGBTQ community, also wore pearls, nail polish, and a hot-pink blouse with matching suspenders. Fans cheered and waved rainbow flags just below the stage. In November, Styles memorably played a gay social media manager in the "Sara Lee" sketch of Saturday Night Live.

In addition to the new songs from Fine Line, Styles also surprised fans at the Friday concert with a version of "What Makes You Beautiful," the 2011 hit from One Direction, as well as a cover of Paul McCartney's holiday hit, "Simply Having a Wonderful Christmas Time," which coincided with fake snow floating from the ceiling of the arena. He also sang songs from his debut album, including "Kiwi."

In the spirit of McCartney, Styles inspired his own form of Beatlemania. One fan on the floor either fell or fainted during one of his songs, prompting the singer to pause the concert for a few minutes while assistance could be called. His words, in both his introduction and through several of the songs, were sometimes drowned out by the (mostly female) enthusiastic fans screaming his name or belting along with the lyrics.

Rolling Stone reports that fans, who traveled to L.A. from around the world, camped out in the Forum's parking lot for a week -- in tents -- to snag a prime space at the venue. Tickets for the event were only $25, but predictably, sold out in a flash.

At the conclusion of the show, Styles thanked Nicks, as well as all of the fans who traveled to see him. "This album is yours. I am yours," he told the crowd.

Fine Line is now available on major streaming services and wherever good music is sold. Watch the video for "Lights Up" below.