Kim Kardashian stuns in slinky black dress at music release party

Sometimes the simplest looks are the sexiest.

Kim Kardashian unexpectedly stepped out for the release of Marina Acton's new single, "Fantasize," on Monday night at Boulevard3 in Hollywood, California, and she looked absolutely stunning in a super simple black dress.

The KKW Beauty founder rocked the form-fitting, floor-length black ensemble that featured spaghetti straps and showed off her signature hourglass figure. She didn't wear any jewelry with the look, which allowed her piercing pink hair to command full attention. She appeared to also wear glittering heels to complete the look.

See Kim Kardashian's look in the gallery below:

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Kim Kardashian out and about in 2018
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Kim Kardashian out and about in 2018
BEVERLY HILLS, CA - MARCH 31: Kim Kardashian West attends KKWxMario Dinner at Jean-Georges Beverly Hills on March 31, 2018 in Beverly Hills, California. (Photo by Stefanie Keenan/WireImage)
WASHINGTON DC, UNITED STATES - 2018/03/24: Kim Kardashian and Husband Kanye West along with Daughter North West, show up to support March For Our Lives. Tens of thousands of Americans took to the street on Washington DC during the 'March for our Lives' demonstration against gun violence in schools in the United States. (Photo by Emilee McGovern/SOPA Images/LightRocket via Getty Images)
WASHINGTON, DC - MARCH 24: Kanye West and Kim Kardashian West attend March For Our Lives on March 24, 2018 in Washington, DC. (Photo by Paul Morigi/Getty Images for March For Our Lives)
WEST HOLLYWOOD, CA - MARCH 13: Kim Kardashian West attends Lorraine Schwartz launches The Eye Bangle a new addition to her signature Against Evil Eye Collection at Delilah on March 13, 2018 in West Hollywood, California. (Photo by Stefanie Keenan/Getty Images for Lorraine Schwartz )
WEST HOLLYWOOD, CA - MARCH 13: Kim Kardashian West attends Lorraine Schwartz launches The Eye Bangle a new addition to her signature Against Evil Eye Collection at Delilah on March 13, 2018 in West Hollywood, California. (Photo by Stefanie Keenan/Getty Images for Lorraine Schwartz )
CHATSWORTH, CA - MARCH 09: Kim Kardashian watches courtside as Sierra Canyon plays Foothills Christian for the CIF Open Division Playoffs at Sierra Canyon High School on March 9, 2018 in Chatsworth, California. (Photo by Cassy Athena/Getty Images)
LOS ANGELES, CA - MARCH 06: Kim Kardashian West speaks onstage at MDNA SKIN hosts Madonna and Kim Kardashian West for a beauty conversation at YouTube Space LA on March 6, 2018 in Los Angeles, California. (Photo by Kevin Mazur/Getty Images for Madonna's MDNA SKIN)
LOS ANGELES, CA - MARCH 06: Kim Kardashian west and Madonna backstage at MDNA SKIN hosts Madonna and Kim Kardashian West for a beauty conversation at YouTube Space LA on March 6, 2018 in Los Angeles, California. (Photo by Kevin Mazur/Getty Images for Madonna's MDNA SKIN)
HOLLYWOOD, CA - MARCH 05: Kim Kardashian attends the release of Marina Acton's new single 'Fantasize' at Boulevard3 on March 5, 2018 in Hollywood, California. (Photo by Jerritt Clark/Getty Images)
HOLLYWOOD, CA - MARCH 05: Marina Acton and Kim Kardashian take a selfie at the release of Marina Acton's new single 'Fantasize' at Boulevard3 on March 5, 2018 in Hollywood, California. (Photo by Jerritt Clark/Getty Images)
TOKYO, JAPAN - MARCH 02: Kim Kardashian, Kourtney Kardashian and Khloe Kardashian are seen upon arrival at Tokyo Station on March 2, 2018 in Tokyo, Japan. (Photo by Jun Sato/GC Images)
TOKYO, JAPAN - FEBRUARY 26: Kim Kardashian is seen upon arrival at Haneda Airport on February 26, 2018 in Tokyo, Japan. (Photo by Jun Sato/GC Images)
LOS ANGELES, CA - FEBRUARY 25: Kim Kardashian is seen on February 24, 2018 in Los Angeles, California. (Photo by Hollywood To You/Star Max/GC Images)
LOS ANGELES, CA - FEBRUARY 24: Entrepreneur Kim Kardashian West at the Create & Cultivate Los Angeles conference in the Simon G. Jewelry Green Room on February 24, 2018 in Los Angeles, California. (Photo by Vivien Killilea/Getty Images for Create & Cultivate )
LOS ANGELES, CA - FEBRUARY 07: Kim Kardashian is seen on February 07, 2018 in Los Angeles, California. (Photo by BG002/Bauer-Griffin/GC Images)
LOS ANGELES, CA - FEBRUARY 07: Kim Kardashian is seen on February 07, 2018 in Los Angeles, California. (Photo by BG005/Bauer-Griffin/GC Images)
LOS ANGELES, CA - JANUARY 12: Kim Kardashian and Kanye West are seen on January 12, 2018 in Los Angeles, California. (Photo by BG022/Bauer-Griffin/GC Images)
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It appears as though Kardashian was there to support her publicist's husband, Ray Rumulus, who produced the song being celebrated. 

"Hanging with my girl @marina_acton last night at her single release party for Fantasize produced by @rayromulus," she wrote on Instagram. "Go check it out available now everywhere!"

Ray is married to Tracy Romulus, who is Kim's publicist and longtime friend. Her daughter, Ryan, is best friends with Kim's daughter, North.

Kardashian definitely had a great time at the event, and she was seen partying with "Hot Mugshot Guy" Jeremy Meeks, who was sitting at her table.

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