A somber Gwen Stefani spotted for the first time since Gavin Rossdale divorce news

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Gwen Stefani Files for Divorce from Husband Gavin Rossdale

Gwen Stefani is focusing on her work.

The 45-year-old No Doubt frontwoman was spotted in Beverly Hills, California, on Friday at an office building in Los Angeles, marking the first time she's been seen publicly since news broke on Tuesday that she and Bush rocker Gavin Rossdale were divorcing after more than a decade of marriage.

Not surprisingly, Gwen didn't appear in the best of moods as she arrived alone, but did look like her usual stylish self in a red flannel shirt, rolled-up boyfriend jeans, and open-toed fringe heels.

WATCH: Gavin Rossdale Steps Out Amid Gwen Stefani Divorce Filing

On Monday, Gavin also stepped out in Beverly Hills, looking cool and casual, just before news broke of the split. The 49-year-old musician was snapped going shopping with a dog and a friend, and appeared to be pretty relaxed.

In documents obtained by ET, Gwen cited "irreconcilable differences" in her divorce petition filed on Monday, asking for joint custody of the couple's three sons: 9-year-old Kingston, 6-year-old Zuma, and 1-year-old Apollo. Gavin filed his response at the same time, and is also asking for joint custody.

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Gwen Stefani and Gavin Rossdale through the years
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A somber Gwen Stefani spotted for the first time since Gavin Rossdale divorce news
WEST HOLLYWOOD, CA - OCTOBER 23: Singer Gwen Stefani and singer Gavin Rossdale attend the City of Hope Spirit of Life Gala honoring Apple's Eddy Cue at the Pacific Design Center on October 23, 2014 in West Hollywood, California. (Photo by Angela Weiss/Getty Images for City Of Hope)
NEW YORK, NY - SEPTEMBER 05: Designer Gwen Stefani and Gavin Rossdale attend the L.A.M.B. presentation during Mercedes-Benz Fashion Week Spring 2015 on September 5, 2014 in New York City. (Photo by Bryan Bedder/Getty Images for L.A.M.B.)
WEST HOLLYWOOD, CA - NOVEMBER 30: Musicians Gavin Rossdale (L) and Gwen Stefani attend PANDORA Jewelry and Moto X present 'American Hustle' at cinema prive at on November 30, 2013 in West Hollywood, California. (Photo by Rich Polk/Getty Images for cinema prive)
BEVERLY HILLS, CA - OCTOBER 17: Musician Gavin Rossdale (L) and singer Gwen Stefani arrive at the Wallis Annenberg Center For The Performing Arts Gala at the Wallis Annenberg Center For The Performing Arts on October 17, 2013 in Beverly Hills, California. (Photo by Kevin Winter/Getty Images)
LOS ANGELES, CA - JUNE 04: Gwen Stefani and Gavin Rossdale attend the premiere of A24's 'The Bling Ring' at Directors Guild Of America on June 4, 2013 in Los Angeles, California. (Photo by Jason Kempin/Getty Images)
HOLLYWOOD, CA - JUNE 17: (L-R) Gwen Stefani, Gavin Rossdale and sons Zuma and Kingston Rossdale attend the world premiere of Disney Pixar's 'Monsters University' at the El Capitan Theatre on June 17, 2013 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
ANTIBES, FRANCE - MAY 19: Gwen Stefani and Gavin Rossdale attend amfAR's Cinema Against AIDS Gala party during the 64th Annual Cannes Film Festival at Hotel Du Cap on May 19, 2011 in Antibes, France. (Photo by Andreas Rentz/Getty Images)
NEW YORK, NY - MAY 06: Gavin Rossdale and Gwen Stefani 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 Dimitrios Kambouris/Getty Images)
US singer Gwen Stefani and musician Gavin Rossdale pose on the red carpet before the screening of 'The Tree of Life' presented in competition at the 64th Cannes Film Festival on May 16, 2011 in Cannes. AFP PHOTO / VALERY HACHE (Photo credit should read VALERY HACHE/AFP/Getty Images)
CANNES, FRANCE - MAY 16: Gwen Stefani (L) and Gavin Rossdale attend 'The Tree Of Life' premiere during the 64th Annual Cannes Film Festival at Palais des Festivals on May 16, 2011 in Cannes, France. (Photo by Pascal Le Segretain/Getty Images)
NEW YORK - MAY 03: Gwen Stefani and Gavin Rossdale attend the Costume Institute Gala Benefit to celebrate the opening of the 'American Woman: Fashioning a National Identity' exhibition at The Metropolitan Museum of Art on May 3, 2010 in New York City. (Photo by Larry Busacca/Getty Images)
LOS ANGELES, CA - NOVEMBER 13: Actress Gwen Stefani and musician Gavin Rossdale arrive at 'The Artist's Museum Happening' MOCA Los Angeles Gala held at MOCA Grand Avenue on November 13, 2010 in Los Angeles, California. (Photo by Frazer Harrison/Getty Images for MOCA)
NEW YORK - SEPTEMBER 06: (L-R) Singer Gavin Rossdale and singer Gwen Stefani attend the men's singles match between Roger Federer of Switzerland and Jurgen Melzer of Austria during day eight of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 6, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)
LOS ANGELES, CA - NOVEMBER 14: Singer Gwen Stefani and Gavin Rossdale arrive at MOCA New 30th Anniversary Gala on November 14, 2009 in Los Angeles, California. (Photo by Frazer Harrison/Getty Images)
LOS ANGELES, CA - NOVEMBER 14: Singer Gwen Stefani (L) and Gavin Rossdale arrive at the MOCA NEW 30th anniversary gala held at MOCA on November 14, 2009 in Los Angeles, California. (Photo by Michael Caulfield/Getty Images for MOCA)
LAS VEGAS - APRIL 21: Music artist Gavin Rossdale (L) and his wife, singer Gwen Stefani, pose after she performed at the grand opening of The Pearl concert theater at the Palms Casino Resort April 21, 2007 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
DEER VALLEY, UT - DECEMBER 06: (EXCLUSIVE ACCESS) (L_R) Musician Gavin Rossdale, singer Gwen Stefani and son Kingston play in the snow at Juma Entertainment's 17th Annual Deer Valley Celebrity Skifest presented by Paul Mitchell and benefitting Robert F. Kennedy's Waterkeeper Alliance at the Empire Canyon Lodge on December 6, 2008 in Deer Valley, Utah. (Photo by Michael Buckner/Getty Images)
LOS ANGELES, CA - NOVEMBER 21: (EXCLUSIVE ACCESS) Singer Gwen Stefani (R) and husband musician Gavin Rossdale pose backstage at the 2006 American Music Awards held at the Shrine Auditorium on November 21, 2006 in Los Angeles, California. (Photo by Michael Buckner/AMA/Getty Images for AMA)
LOS ANGELES, CA - FEBRUARY 08: Musicians Gavin Rossdale and wife Gwen Stefani arrive at the 48th Annual Grammy Awards at the Staples Center on February 8, 2006 in Los Angeles, California. (Photo by Stephen Shugerman/Getty Images)
NEW YORK - SEPTEMBER 16: Singers Gavin Rossdale and Gwen Stefani attend day 8 of Olympus Fashion Week Spring 2006 at Bryant Park September 16, 2005 in New York City. (Photo by Fernando Leon/Getty Images)
LOS ANGELES - MAY 1: Singer Gavin Rossdale and wife Gwen Stefani arrive at the 7th Annual Young Hollywood Awards at the Music Box/Henry Fonda Theater on May 1, 2005 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)
HOLLYWOOD - AUGUST 14: Singer Gwen Stefani (L) and husband musician Gavin Rossdale arrive at the 2005 Teen Choice Awards held at Gibson Amphitheatre at Universal CityWalk on August 14, 2005 in Universal City, California. (Photo by Frazer Harrison/Getty Images)
WEST HOLLYWOOD, CA - FEBRUARY 27: Musician Gavin Rossdale and wife, recording artist Gwen Stefani arrive at the Vanity Fair Oscar Party at Mortons on February 27, 2005 in West Hollywood, California. (Photo by Frazer Harrison/Getty Images)
HOLLYWOOD - FEBRUARY 16: (US TABS AND HOLLYWOOD REPORTER OUT): Actor/musician Gavin Rossdale and wife, actress/singer Gwen Stefani attend the afterparty for the premiere of the Warner Bros. film 'Constantine' at the Geisha House on February 16, 2005 in Hollywood, California. (Photo by Vince Bucci/Getty Images)
LOS ANGELES - FEBRUARY 13: Gwen Stefani is joined by husband Gavin Rossdale as they arrive to the 47th Annual Grammy Awards at the Staples Center February 13, 2005 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)
HOLLYWOOD - DECEMBER 1: Musician Gavin Rossdale and wife, actress-singer Gwen Stefani attend the Los Angeles premiere of 'The Aviator' on December 1, 2004 at the Mann's Chinese Theatre in Hollywood, California. (Photo by Vince Bucci/Getty Images)
ROME - NOVEMBER 18: Singer Gwen Stefani and her husband Gavin Rossdale pose during the MTV Europe Music Awards 2004 at Tor di Valle November 18, 2004 in Rome, Italy. (Photo by Getty Images/Getty Images)
LOS ANGELES - NOVEMBER 14: Musician Gavin Rossdale and partner Gwen Stefani attend 'Gwen Stefani's Solo Album Relaese Party' at the Downtown Standard Hotel November 14, 2004 in Los Angeles, California. (Photo by Mark Mainz/Getty Images)
RED Prom 2006 - Edgy Look 2 Girl - Karina Location: Oheka Castle Date: 01/19/2006 Photographer: Jamie Koslow Credit: Jamie Koslow, AOL RED Prom 2006 Oheka Castle Prom product clothes edgy look 2 Karina
LOS ANGELES - NOVEMBER 14: (TABLOIDS OUT) Musicians Gwen Stefani and Gavin Rossdale attend the 2003 Presentation of the 18th Annual American Cinematheque Award at the Beverly Hilton November 14, 2003 in Beverly Hills, California. (Photo by Frazer Harrison/Getty Images)
HOLLYWOOD - NOVEMBER 8: Singers Gavin Rossdale and wife Gwen Stefani attend the world premiere of 'Dr. Seuss' The Cat in the Hat' at Universal Studios, November 8, 2003 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
HOLLYWOOD - JULY 15: Singers Gwen Stefani and Gavin Rossdale arrive at the celebrity-filled Duran Duran gig at The Roxy Theater on July 13, 2003 in Hollywood, California. The show was one of the first in 18 years to feature all five original bandmembers. (Photo by Amanda Edwards/Getty Images)
WEST HOLLYWOOD, CA - JANUARY 16: No Doubt singer Gwen Stefani and her husband musician Gavin Rossdale attend the Maserati Kicks Off Golden Globe Weekend gala with a special performance by the Pussycat Dolls at the Pacific Design Center on January 16, 2003 in West Hollywood, California. (Photo by Jon Kopaloff/Getty Images)
HOLLYWOOD, CA - DECEMBER 3: NNo Doubt's Gwen Stefani and husband singer Gavin Rossdale attend the Maxim Magazine Heats Up Los Angeles With The Pussycat Dolls party to celebrate the December issue of 'Maxim' magazine at The Henry Fonda Theatre December 3, 2002 in Hollywood, California. (Photo by Jon Kopaloff/Getty Images)
Gavin Rossdale and Gwen Stefani at the premiere of 'XXX' at the Village Theater in Westwood, Ca. Monday, August 5, 2002. Photo by Kevin Winter/ImageDirect.
Gavin Rossdale (Bush) and Gwen Stefani (No Doubt) at the premiere of 'The Mexican' at the National Theater in Los Angeles, Ca. 2/23/01.(Photo by Kevin Winter/Getty Images).
WESTWOOD, CA - AUGUST 5: Singer Gwen Stefani (L) and her boyfriend and singer Gavin Rossdale attend the premiere of 'XXX' at the Mann Village and Bruin Theatres August 5, 2002 in Westwood, California. The film opens in theaters nationwide August 9, 2002. (Photo by Robert Mora/Getty Images)
Photo by: Tim Goodwin STAR MAX, Inc. - copyright 2003 ALL RIGHTS RESERVED Telephone/Fax: (212) 995-1196 6/18/03 Gwen Stefani and Gavin Rossdale at the premiere of "Charlie's Angels: Full Throttle". (CA) (Star Max via AP Images)
Music recording artists Gwen Stefani and Gavin Rossdale arrive at the premiere of "Charlie's Angels: Full Throttle," Wednesday, June 18, 2003, in the Hollywood Section of Los Angeles. (AP Photo/Chris Weeks)
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The Insider recently caught up with Gavin's former gay lover, London-based pop singer Marilyn Robinson, who said he wasn't surprised by the pair's split announcement.

"I'm getting kind of the gist that people want me to be somehow to blame for the marriage split and that's just not true," Robinson stressed. "I love Gavin. I've always loved Gavin. I want him to be happy, and Gwen to be happy, and the kids to be happy."

Robinson said he and Gavin -- who he met in the early '80s when the two were both up-and-coming musicians in the London club scene -- have stayed in touch over the years, and even talked on the phone just a few weeks ago. "He was frustrated and kind of upset. Which makes absolute sense, really. Due to the recent revelations from the divorce and everything, it all makes sense now," he shared.

NEWS: 11 Times Gwen Stefani and Gavin Rossdale Got Real About Their Marriage and Kids

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