Mary-Kate Olsen makes rare public appearance at Moda Operandi's NYFW party

We don't often see Mary-Kate Olsen, but when we do, we know she'll still be nailing that ultra-cool NYC-but-boho aesthetic.

The 33-year-old fashion designer, whose label The Row will showcase its spring 2020 collection on the runway during New York Fashion Week, made an appearance at Moda Operandi's NYFW party on Thursday. Twin Ashley was absent from the event.

Looking demure in a black long-sleeved number, Mary-Kate posed for a photo with Sara Moonves, who is the Editor-in-Chief of W Magazine (and the daughter of ousted CBS CEO Les Moonves).

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Mary-Kate Olsen in 2019
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Mary-Kate Olsen in 2019
Mary-Kate Olsen with Sara Moonves at Moda Operandi New York Fashion Week event on September 5, 2019. (Photo: Sandra Samberg)
NEW YORK, NY - JUNE 03: Mary Kate Olsen and Ashley Olsen at CFDA awards on June 3, 2019 in New York City (Photo by J. Lee/FilmMagic)
CHANTILLY, FRANCE - JULY 13: American rider Mary Kate Olsen, competes during the Longines Global Champions Tour of Chantilly, at Hippodrome de Chantilly on July 13, 2019 in Chantilly, France. (Photo by Stephane Allaman/ALeA/Getty Images)"n
CHANTILLY, FRANCE - JULY 13: American rider Mary Kate Olsen, competes during the Longines Global Champions Tour of Chantilly, at Hippodrome de Chantilly on July 13, 2019 in Chantilly, France. (Photo by Stephane Allaman/ALeA/Getty Images)"n
NEW YORK, NY - JUNE 03: Mary-Kate Olsen and Ashley Olsen attend the 2019 CFDA Fashion Awards at The Brooklyn Museum on June 3, 2019 in New York City. (Photo by Taylor Hill/FilmMagic)
MADRID, SPAIN - MAY 18: Mary-Kate Olsen competes during Madrid-Longines Champions, the International Global Champions Tour at Club de Campo Villa de Madrid on May 18, 2019 in Madrid, Spain. (Photo by Samuel de Roman/Getty Images)
Mary Kate Olsen during Madrid-Longines Champions, the International Global Champions Tour at Club de Campo Villa de Madrid on May 17, 2019 in Madrid, Spain. (Photo by Oscar Gonzalez/NurPhoto via Getty Images)
NEW YORK, NY - MAY 06: Mary-Kate Olsen and Ashley Olsen attends The 2019 Met Gala Celebrating Camp: Notes On Fashion - Arrivalsat The Metropolitan Museum of Art on May 6, 2019 in New York City. (Photo by Rabbani and Solimene Photography/WireImage)
NEW YORK, NEW YORK - MAY 06: Mary-Kate Olsen and Ashley Olsen attend The 2019 Met Gala Celebrating Camp: Notes on Fashion at Metropolitan Museum of Art on May 06, 2019 in New York City. (Photo by Matt Winkelmeyer/MG19/Getty Images for The Met Museum/Vogue)
NEW YORK, NEW YORK - MAY 06: Mary-Kate Olsen and Ashley Olsen attend The 2019 Met Gala Celebrating Camp: Notes On Fashion at The Metropolitan Museum of Art on May 06, 2019 in New York City. (Photo by John Shearer/Getty Images for THR)
NEW YORK, NEW YORK - APRIL 18: Mary Kate Olsen, guest, Olivier Sarkozy and Greg Hymowitz attend YAGP's 20th Anniversary Gala 'Stars Of Today Meets The Stars Of Tomorrow at David Koch Theatre at Lincoln Center on April 18, 2019 in New York City. (Photo by Jared Siskin/Patrick McMullan via Getty Images)
NEW YORK, NEW YORK - APRIL 18: Mary Kate Olsen and Marcella Guarino Hymowitz attend YAGP's 20th Anniversary Gala 'Stars Of Today Meets The Stars Of Tomorrow at David Koch Theatre at Lincoln Center on April 18, 2019 in New York City. (Photo by Jared Siskin/Patrick McMullan via Getty Images)
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Moda Operandi co-founder Lauren Santo Domingo hosted the ultra-exclusive event at her home, greeting famous faces including Sienna Miller, Poppy Delevingne and Tory Burch. Guests toasted Moda Operandi's just-debuted rebranded design.

The Olsen twins are considered two of the most elusive socialites of the New York City scene. Although they make occasional annual appearances, like at the Met Gala and the CFDA Fashion Awards, they largely stay under the radar.

Mary-Kate has said that she's kept busy as a stepmom to two children. Her husband is 50-year-old Olivier Sarkozy, the brother of former French president Nicolas Sarkozy.

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Mary-Kate Olsen and Olivier Sarkozy
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Mary-Kate Olsen and Olivier Sarkozy
NEW YORK, NY - OCTOBER 11: Olivier Sarkozy and Mary-Kate Olsen attend the 2017 Take Home A Nude Art Party and auction at Sotheby's on October 11, 2017 in New York City. (Photo by John Lamparski/WireImage)
NEW YORK, NY - OCTOBER 11: (L-R) Olivier Sarkozy and Mary-Kate Olsen attend 2017 Take Home A Nude Art party and auction at Sotheby's on October 11, 2017 in New York City. (Photo by Astrid Stawiarz/Getty Images)
NEW YORK, NY - APRIL 13: Co-chairs Ashley Olsen (L) and Mary-Kate Olsen, and Olivier Sarkozy attend the Youth America Grand Prix Stars of Today Meet the Stars of Tomorrow Gala at the David H. Koch Theater at Lincoln Center on April 13, 2017 in New York City.(Photo by Rebecca Smeyne/Getty Images)
NEW YORK, NY - NOVEMBER 20: Olivier Sarkozy and Mary-Kate Olsen attend the Indiana Pacers vs New York Knicks game at Madison Square Garden on November 20, 2013 in New York City. (Photo by James Devaney/WireImage)
NEW YORK, NY - NOVEMBER 09: Mary-Kate Olsen and Olivier Sarkozy attend the Dallas Mavericks vs New York Knicks game at Madison Square Garden on November 9, 2012 in New York City. (Photo by James Devaney/WireImage)
NEW YORK, NY - NOVEMBER 20: Olivier Sarkozy and Mary-Kate Olsen attend the Indiana Pacers vs New York Knicks game at Madison Square Garden on November 20, 2013 in New York City. (Photo by James Devaney/FilmMagic)
EAST HAMPTON, NY - AUGUST 24: Olivier Sarkozy and Mary Kate Olsen attend 4th Annual Apollo In The Hamptons Benefit on August 24, 2013 in East Hampton, New York. (Photo by Shahar Azran/WireImage)
NEW YORK, NY - NOVEMBER 09: Mary-Kate Olsen and Olivier Sarkozy attend the Dallas Mavericks vs New York Knicks game at Madison Square Garden on November 9, 2012 in New York City. (Photo by James Devaney/WireImage)
NEW YORK, NY - SEPTEMBER 1: Mary-Kate Olsen and her boyfriend Olivier Sarkozy, brother of former French President Nicolas Sarkozy attend Day 8 of the 2014 US Open at USTA Billie Jean King National Tennis Center on September 1, 2014 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Jean Catuffe/GC Images)
NEW YORK, NY - SEPTEMBER 01: Olivier Sarkozy and Mary-Kate Olsen attend day 8 of the 2014 US Open at USTA Billie Jean King National Tennis Center on September 1, 2014 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Uri Schanker/GC Images)
NEW YORK, NY - SEPTEMBER 01: Olivier Sarkozy and Mary Kate Olsen attend day 8 of the 2014 US Open at USTA Billie Jean King National Tennis Center on September 1, 2014 in New York City. (Photo by Uri Schanker/GC Images)
NEW YORK, NY - OCTOBER 08: Mary-Kate Olsen, Olivier Sarkozy and David Kratz attend 2013 'Take Home A Nude' Benefit Art Auction And Party at Sotheby's on October 8, 2013 in New York City. (Photo by Monica Schipper/Getty Images)
NEW YORK, NY - NOVEMBER 09: Mary-Kate Olsen and Olivier Sarkozy attend the Dallas Mavericks vs New York Knicks game at Madison Square Garden on November 9, 2012 in New York City. (Photo by James Devaney/WireImage)
NEW YORK, NY - NOVEMBER 20: Olivier Sarkozy and Mary-Kate Olsen attend the Indiana Pacers vs New York Knicks game at Madison Square Garden on November 20, 2013 in New York City. (Photo by James Devaney/WireImage)
NEW YORK, NY - DECEMBER 14: Olivier Sarkozy and Mary-Kate Olsen attend the Atlanta Hawks vs New York Knicks game at Madison Square Garden on December 14, 2013 in New York City. (Photo by James Devaney/WireImage)
NEW YORK, NY - NOVEMBER 03: Olivier Sarkozy and Mary-Kate Olsen attend the Minnesota Timberwolves vs New York Knicks game at Madison Square Garden on November 3, 2013 in New York City. (Photo by James Devaney/WireImage)
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