Christina Aguilera and fiancé Matt Rutler take rare public outing together

Are we back in the '90s?!

Christina Aguilera and her rarely-seen fiancé Matt Rutler channeled the era that launched her career on Tuesday night when they stepped out for Stella McCartney's Autumn 2018 Presentation in Los Angeles -- and they looked absolutely fierce.

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Aguilera went with an all-black look complete with knee-high boots, an oversized wrap dress, a chain necklace, newsboy cap and small-framed black sunglasses. Her new minimal-makeup styling brought her chic look to the next level.

See photos of Christina Aguilera and Matt Rutler:

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Christina Aguilera and Matt Rutler together
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Christina Aguilera and Matt Rutler together
LOS ANGELES, CA - JANUARY 16: Christina Aguilera and Matt Rutler arrives at the Stella McCartney's Autumn 2018 Collection Launch on January 16, 2018 in Los Angeles, California. (Photo by Steve Granitz/WireImage)
WESTWOOD, CA - JULY 23: Christina Aguilera, Matthew Rutler, Max Liron Bratman and Summer Rain Rutler attend the premiere of 'The Emoji Movie' at Regency Village Theatre on July 23, 2017 in Westwood, California. (Photo by Jason LaVeris/FilmMagic)
MOUNTAIN VIEW, CA - NOVEMBER 09: Singer Christina Aguilera (R) and Matt Rutler attend the Breakthrough Prize Awards Ceremony Hosted By Seth MacFarlane at NASA Ames Research Center on November 9, 2014 in Mountain View, California. (Photo by Steve Jennings/Getty Images for Breakthrough Prize)
WESTWOOD, CA - JULY 23: Christina Aguilera, Matthew Rutler, Max Liron Bratman and Summer Rain Rutler attend the premiere of 'The Emoji Movie' at Regency Village Theatre on July 23, 2017 in Westwood, California. (Photo by Jason LaVeris/FilmMagic)
NEW YORK, NY - APRIL 18: Christina Aguilera and Matt Rutler are seen on April 18, 2014 in New York City. (Photo by David Krieger/Bauer-Griffin/GC Images)
NARITA, JAPAN - APRIL 02: (EXCLUSIVE ACCESS SPECIAL RATES APPLY) Singer Christina Aguilera, Max Liron Bratman and Matt Rutler are seen at Narita International Airport on April 2, 2013 in Narita, Japan. (Photo by Jun Sato/WireImage)
NEW YORK, NY - APRIL 17: Christina Aguilera and Matt Rutler are seen in Tribeca on April 17, 2014 in New York City. (Photo by Alo Ceballos/GC Images)
LOS ANGELES, CA - OCTOBER 28: Christina Aguilera and Matt Rutler are seen at Halloween Party on October 28, 2012 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
LOS ANGELES, CA - OCTOBER 25: Singer Christina Aguilera (L) and Matt Rutler attend the Samsung Galaxy Note II Beverly Hills Launch Party on October 25, 2012 in Los Angeles, California. (Photo by Jason Merritt/Getty Images for Samsung)
LOS ANGELES, CA - MARCH 29: Matt Rutler (L) and Christina Aguilera attend a basketball game between the Oklahoma City Thunder and the Los Angeles Lakers at Staples Center on March 29, 2012 in Los Angeles, California. (Photo by Noel Vasquez/Getty Images)
LOS ANGELES, CA - NOVEMBER 08: Actress/singer Christina Aguilera and boyfriend Matt Rutler attend the 'The Elder Scrolls V: Skyrim' video game launch party at Belasco Theatre on November 8, 2011 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - OCTOBER 17: Christina Aguilera and Matt Rutler are seen at Off Vines restaurant on October 17, 2011 in Los Angeles, California. (Photo by JB Lacroix/WireImage)
NEW YORK, NY - MAY 16: Singer Christina Aguilera (R) and Matt Rutler enter the Hilton Hotel on May 16, 2011 in New York City. (Photo by Ray Tamarra/Getty Images)
NEW YORK, NY - MAY 16: Singer Christina Aguilera (R) and Matt Rutler enter the 'Late Show With David Letterman' taping at the Ed Sullivan Theater on May 16, 2011 in New York City. (Photo by Ray Tamarra/FilmMagic)
BEVERLY HILLS, CA - JANUARY 16: Matt Rutler and Christina Aguilera attend the InStyle and Warner Bros. 68th annual Golden Globe awards post-party at The Beverly Hilton hotel on January 16, 2011 in Beverly Hills, California. (Photo by John Shearer/Getty Images)
68th ANNUAL GOLDEN GLOBE AWARDS -- Pictured: (l-r) Matt Rutler, Christina Aguilera arrive at the 68th Annual Golden Globe Awards held at the Beverly Hilton Hotel on January 16, 2011 (Photo by Evan Agostini/NBC/NBCU Photo Bank via Getty Images)
BEVERLY HILLS, CA - JANUARY 16: Singer/actress Christina Aguilera (R) and boyfriend Matt Rutler arrive at the 68th Annual Golden Globe Awards held at The Beverly Hilton hotel on January 16, 2011 in Beverly Hills, California. (Photo by Jason Merritt/Getty Images)
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Rutler donned a simple black tee under a grey suit jacket.

The couple hadn't appeared on a red carpet together since they brought their kids to the premiere of "The Emoji Movie" back in July. They've been together for about eight years.

Aguilera, who has always been relatively private about her personal life, made her triumphant return to the spotlight back in November, though, when she paid tribute to Whitney Houston at the 2017 American Music Awards.

Of course, Aguilera wasn't the only star on-hand to celebrate Stella McCartney on Tuesday, either! Katy Perry, Selma Blair, Amy Poehler and more celebs were there for the event.

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