Kim Kardashian sports super sheer top at Justin Bieber concert to show off 42-pound weight loss

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Kim Kardashian Shows off 42-Pound Weight Loss in Sheer Top

The star-studded Justin Bieber concert at the Staples Center in Los Angeles on Wednesday night also turned out to be a Kardashian family affair.

Kim Kardashian West and her husband, Kanye West, attended the show after already taking in Justin's concert on Monday night, along with Kim's sisters, Kourtney Kardashian, Kendall and Kylie Jenner, and Kylie's boyfriend, Tyga. Wednesday night also marked Kourtney's second time seeing Justin in Los Angeles during his Purpose tour, after she was spotted hanging with the "Sorry" singer's mom, Pattie Mallette, backstage on Sunday night.

Rocking a completely sheer top and a tight-fitting black skirt, Kim looked incredible, flaunting her weight loss since giving birth to son Saint in December. On Monday, Kim revealed on her app that she's already lost 42 pounds, and has a goal to lose 28 more.

See more photos of Kim Kardashian through the years:

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Kim Kardashian through the years
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Kim Kardashian sports super sheer top at Justin Bieber concert to show off 42-pound weight loss
HOLLYWOOD - JULY 07: Kim Kardashian arrives at the Midsummer Night's Dream Celebrity Poker evening held at the Avalon club on July 7, 2006 in Hollywood, California (Photo by Frazer Harrison/Getty Images)
LOS ANGELES - AUGUST 18: Socialite Kim Kardashian (left) and actress/singer Paris Hilton arrive at Paris Hilton's debut cd release party at Privilege on August 18, 2006 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)
HOLLYWOOD, CA - NOVEMBER 16: Kim Kardashian poses for a picture at the launch party for the Nintendo 'Wii' game console November 16, 2006 held at 'Boulevard 3' in Los Angeles, California. (Photo by Toby Canham/Getty Images)
LAS VEGAS - JUNE 16: Socialite Kim Kardashian arrives at the fourth anniversary party for Vegas Magazine on the closing night of the CineVegas film festival at the Mandalay Bay Resort & Casino June 16, 2007 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for CineVegas)
LOS ANGELES, CA - JUNE 21: Socialite Kim Kardashian poses at the OmniPeace Event to stop extreme poverty in Sub-Saharan Africa by 2025 at Kitson Men on June 21, 2007 in Los Angeles, California. (Photo by Charley Gallay/Getty Images)
MIAMI BEACH, FL - JULY 13: Socailite Kim Kardashian attends the Ashley Paige swimwear fashion show during 'Mercedes Benz Fashion Week: Miami Swim' in the Cabana Grande tent at the Raleigh Hotel on July 13, 2007 in Miami Beach. (Photo by Evan Agostini/Getty Images for Ashley Paige)
LOS ANGELES, CA - JULY 18: Socialite Kim Kardashian arrives at a party for the Chelsea Football Club at a private estate on July 18, 2007 in Los Angeles, California. (Photo by Charley Gallay/Getty Images)
LOS ANGELES - OCTOBER 25: TV personality Kim Kardashian arrives at the premiere of 'Somebody Help Me' at the Chinese Theatre on October 25, 2007 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)
PARK CITY, UT - JANUARY 19: NFL player Reggie Bush (L) and TV personality Kim Kardashian on the street during the 2008 Sundance Film Festival on January 19, 2008 in Park City, Utah. (Photo by Scott Halleran/Getty Images)
HOLLYWOOD, CA. - MARCH 19: (L-R) Television personalities and sisters Kim Kardashian, Khloe Kardashian, and Kourtney Kardashian attend the season two launch of 'Keeping Up With The Kardashians' at Les Deux on March 19, 2008 in Hollywood, California. (Photo by Charley Gallay/Getty Images)
LOS ANGELES, CA - APRIL 07: Television personality Kim Kardashian celebrates the launch of the new fall Bongo collection at the Los Angeles Fashion Mart on April 7, 2008 in Los Angeles, California. (Photo by Charley Gallay/Getty Images)
MONTE CARLO, MONACO - JUNE 11: TV personality Kim Kardashian (C) with her mother Kris (L) and sister Kourtney attend a photocall promoting the television series 'Keeping Up With the Kardashians' on the fourth day of the 2008 Monte Carlo Television Festival held at Grimaldi Forum on June 11, 2008 in Monte Carlo, Principality of Monaco. (Photo by Pascal Le Segretain/Getty Images)
LOS ANGELES, CA - AUGUST 27: Television personality Kim Kardashian arrives at the Launch Party for the New BlackBerry 8330 Pink Curve xxclusively from Verizon Wireless on the 15th Anniversary of Intermix on August 27, 2008 at Intermix on Robertson, Los Angeles, CA. (Photo by Frazer Harrison/Getty Images)
GUADALAJARA, MEXICO - OCTOBER 16: Television personality Kim Kardashian poses in the press room during the 7th Annual 'Los Premios MTV Latin America 2008' Awards held at the Auditorio Telmex on October 16, 2008 in Guadalajara, Mexico. (Photo by Gustavo Caballero/Getty Images)
NEW YORK - FEBRUARY 16: TV personality Kim Kardashian (right) and Reggie Bush of the New Orleans Saints pose backstage during Mercedes-Benz Fall 2009 Fashion Week at Bryant Park on February 16, 2009 in New York City. (Photo by Thos Robinson/Getty Images)
LOS ANGELES, CA - JUNE 22: TV personality Kim Kardashian arrives at the premiere of Dreamworks' 'Transformers: Revenge Of The Fallen' held at Mann Village Theatre on June 22, 2009 in Los Angeles, California. (Photo by Frazer Harrison/Getty Images)
NEW YORK - SEPTEMBER 14: TV personality Kim Kardashian attends Jill Stuart Spring 2010 fashion show at The New York Public Library on September 14, 2009 in New York, New York. (Photo by Jason Kempin/Getty Images for IMG)
NEW YORK - FEBRUARY 11: TV personality Kim Kardashian backstage at the Heart Truth Fall 2010 Fashion Show during Mercedes-Benz Fashion Week at The Tent at Bryant Park on February 11, 2010 in New York City. (Photo by Jemal Countess/Getty Images for IMG)
NEW YORK - FEBRUARY 15: TV personality Kim Kardashian promotes the launch of her new 'Kim Kardashian' fragrance at Sephora on February 15, 2010 in New York City. (Photo by Michael Loccisano/Getty Images)
WASHINGTON - MAY 01: Kim Kardashian attends the White House Correspondents' Association dinner after party hosted by Niche Media and Capitol File magazine at The Mayflower Renaissance Washington DC Hotel on May 1, 2010 in Washington, DC. (Photo by Leigh Vogel/Getty Images)
LOS ANGELES, CA - JUNE 24: (L-R) Sisters Kourtney Kardashian, Kendall Jenner, Kim Kardashian, Kylie Jenner arrive at the premiere of Summit Entertainment's 'The Twilight Saga: Eclipse' during the 2010 Los Angeles Film Festival at Nokia Theatre L.A. Live on June 24, 2010 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)
UNIVERSAL CITY, CA - AUGUST 08: TV personality Kim Kardashian arrives at the 2010 Teen Choice Awards at Gibson Amphitheatre on August 8, 2010 in Universal City, California. (Photo by Jason Merritt/Getty Images)
LOS ANGELES, CA - JANUARY 14: Kim Kardashian arrives at the 16th annual Critics' Choice Movie Awards at the Hollywood Palladium on January 14, 2011 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
LOS ANGELES, CA - FEBRUARY 25: Kim Kardashian (L) and Kourtney Kardashian (R) arrive at QVC Red Carpet Style Party on February 25, 2011 in Los Angeles, California. (Photo by Valerie Macon/Getty Images)
MONACO - MAY 27: Kim Kardashian (L) and Kris Humphries (R) arrive to attend the AmberLounge Fashion Monaco 2011 on May 27, 2011 in Monaco. (Photo by Pascal Le Segretain/Getty Images)
LOS ANGELES, CA - AUGUST 28: TV Personality Kim Kardashian arrives at the 2011 MTV Video Music Awards at Nokia Theatre L.A. LIVE on August 28, 2011 in Los Angeles, California. (Photo by Christopher Polk/Getty Images)
NEW YORK, NY - SEPTEMBER 13: TV personality Kim Kardashian poses backstage at the Vera Wang Spring 2012 fashion show during Mercedes-Benz Fashion Week at The Stage at Lincoln Center on September 13, 2011 in New York City. (Photo by Craig Barritt/Getty Images for Mercedes-Benz Fashion Week)
NEW YORK, NY - OCTOBER 17: Kim Kardashian attends the 2011 Angel Ball To Benefit Gabrielle's Angel Foundation at Cipriani Wall Street on October 17, 2011 in New York City. (Photo by Andrew H. Walker/Getty Images)
LOS ANGELES, CA - JANUARY 14: TV personality Kim Kardashian arrives at the Cinema For Peace event benefitting J/P Haitian Relief Organization in Los Angeles held at Montage Hotel on January 14, 2012 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images For J/P Haitian Relief Organization and Cinema For Peace)
LOS ANGELES, CA - FEBRUARY 26: TV personality Kim Kardashian arrives at the 20th Annual Elton John AIDS Foundation's Oscar Viewing Party held at West Hollywood Park on February 26, 2012 in West Hollywood, California. (Photo by Frederick M. Brown/Getty Images)
LONDON, ENGLAND - MAY 17: Kim Kardashian attends The FiFi UK Fragrance Awards 2012 at The Brewery on May 17, 2012 in London, England. (Photo by Ben Pruchnie/Getty Images)
LOS ANGELES, CA - JULY 01: (L-R) Television personality Kim Kardashian and rapper Kanye West attend the 2012 BET Awards at The Shrine Auditorium on July 1, 2012 in Los Angeles, California. (Photo by Christopher Polk/Getty Images For BET)
FRANKFURT AM MAIN, GERMANY - NOVEMBER 11: Kim Kardashian presents the award for Best Song onstage at the MTV EMA's 2012 at Festhalle Frankfurt on November 11, 2012 in Frankfurt am Main, Germany. (Photo by Andreas Rentz/Getty Images for MTV)
MELBOURNE, AUSTRALIA - SEPTEMBER 21: Kim Kardashian makes public appearance at Westfield Southland on September 21, 2012 in Melbourne, Australia. (Photo by Lucas Dawson/Getty Images)
LOS ANGELES, CA - FEBRUARY 24: Television Personalities Kourtney Kardashian and Kim Kardashian arrive at the 21st Annual Elton John AIDS Foundation's Oscar Viewing Party on February 24, 2013 in Los Angeles, California. (Photo by Frederick M. Brown/Getty Images)
BEVERLY HILLS, CA - MARCH 02: Television Personality Kim Kardashian attends DuJour magazine's Spring issue collaboration with Kim Kardashian and Bruce Weber at the Four Seasons Hotel Los Angeles at Beverly Hills on March 2, 2013 in Beverly Hills, California. (Photo by Frazer Harrison/Getty Images)
PARIS, FRANCE - SEPTEMBER 29: Kim Kardashian attends the Givenchy show as part of the Paris Fashion Week Womenswear Spring/Summer 2014 on September 29, 2013 in Paris, France. (Photo by Pascal Le Segretain/Getty Images)
NEW YORK, NY - MAY 06: Kim Kardashian (L) and Kanye West attend the Costume Institute Gala for the 'PUNK: Chaos to Couture' exhibition at the Metropolitan Museum of Art on May 6, 2013 in New York City. (Photo by Jamie McCarthy/Getty Images for The Huffington Post)
NEW YORK, NY - MAY 05: [EDITOR'S NOTE: Image has been digitally processed] Kanye West and Kim Kardashian attend the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Andrew H. Walker/Getty Images)
LOS ANGELES, CA - AUGUST 06: Kim Kardashian celebrates summer with the Kardashian Sun Kissed line and fans at ULTA Beauty on August 6, 2014 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
NASHVILLE, TN - JUNE 02: Kim Kardashian West attends the Hype Energy Drinks U.S. Launch on June 2, 2015 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images)
PARIS, FRANCE - SEPTEMBER 28: (L-R) Kim Kardashian and baby North West attend the Givenchy show as part of the Paris Fashion Week Womenswear Spring/Summer 2015 on September 28, 2014 in Paris, France. (Photo by Pascal Le Segretain/Getty Images)
MELBOURNE, AUSTRALIA - NOVEMBER 18: Kim Kardashian arrives to promote her new fragrance 'Fleur Fatale' at a Spice Market event on November 18, 2014 in Melbourne, Australia. (Photo by Scott Barbour/Getty Images)
US reality TV star Kim Kardashian poses during a photocall to present her new cosmetic brand in Paris on April 15, 2015 . AFP PHOTO / LOIC VENANCE (Photo credit should read LOIC VENANCE/AFP/Getty Images)
Kim Kardashian West poses for pictures before launching her collection for Brazil's C&A brand on May 11, 2015 in Sao Paulo, Brazil. AFP PHOTO / MIGUEL SCHINCARIOL (Photo credit should read Miguel Schincariol/AFP/Getty Images)
Photo by: KGC-173/STAR MAX/IPx 7/22/15 Kim Kardashian is seen at LAX Airport. (CA)
Photo by: STRF/STAR MAX/IPx 7/16/15 Kim Kardashian is seen in Los Angeles, CA
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WATCH: Kanye West Excitedly Sings and Dances at Justin Bieber's Show With Kim Kardashian

The 35-year-old reality superstar posted a video on her app on Thursday, reminiscing about how she got in shape again after giving birth to her daughter, 2-year-old North, in June 2013.

"I look back at photos like this that kind of inspire me," she says, sharing a picture of herself looking slim in a pair of leggings and a sports bra. "I remember, 'I did it then, I can do it now,' and I have to be patient. This was, like, a year after I had North. It's still motivating to me."

Unfortunately, Kim didn't post any Snapchats this time around of Kanye's adorable dancing at Justin's concert, but 18-year-old Kylie did post plenty of videos of the sisters and their significant others goofing off at the Staples Center.

Kim, Kanye, and Kourtney all joined Justin at the Warwick lounge in Los Angeles following the concert, where they sat at a VIP table near the DJ booth and appeared to be in "great spirits," a source tells ET. Kim chose not to drink, the source adds, and the trio left at around 1:15 a.m.

"Justin was drinking and having a great time, hanging with his A-list friends and other VIPs," the source says. "Kim, Kourtney and Kanye kept a low profile and let Justin enjoy his special night."

Other celebs at the singer's concert on Wednesday night included his ex, Selena Gomez, and his label-mate, Tori Kelly.

WATCH: Justin Bieber's Mom, Pattie Mallette, Supports Him at Los Angeles Show Following Estrangement

Watch the video below for more on Kim's impressive post-baby weight loss.

Kim Kardashian Flaunts Impressive 42-Pound Weight Loss

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