Shannen Doherty feels 'blessed' for husband's support amid cancer battle

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Shannen Doherty Steps out with Her Husband Following Third Round of Chemotherapy

Shannen Doherty is opening up about her ongoing cancer battle and the support she's getting from her loving husband, Kurt Iswarienko.

The 45-year-old actress took to Instagram on Thursday to post a sweet snapshot of herself and her hubby, laughing, smiling and giving the middle finger as part of the international "F**k Cancer" campaign.

WATCH: Shannen Doherty Steps Out With Her Husband Following Third Round of Chemo

"He loves me with pink hair or no hair," wrote Doherty, who recently shaved her head in anticipation of her battle with the aggressive ailment. "I'm blessed to have such a strong support team starting with @kurtiswarienko who loves me more every second. Can't imagine my life without him."

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Shannen Doherty through the years
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Shannen Doherty through the years
WEST HOLLYWOOD, CA - APRIL 19: Actress Shannen Doherty attends Jennie Garth's 40th birthday celebration and premiere party for 'Jennie Garth: A Little Bit Country' at The London Hotel on April 19, 2012 in West Hollywood, California. (Photo by Angela Weiss/Getty Images)
LOS ANGELES, CA - FEBRUARY 13: Actress Shannen Doherty attends Shepherd Conservation Society's 2nd Annual 'World Love For Dolphins Day' at Japanese Consulate on February 13, 2015 in Los Angeles, California. (Photo by Joe Kohen/Getty Images)
PARIS, FRANCE - MARCH 13: (EXCLUSIVE COVERAGE) Actress Shannen Doherty arrives at Charles-de-Gaulle airport on March 13, 2014 in Paris, France. (Photo by Marc Piasecki/GC Images)
LOS ANGELES, CA - APRIL 09: Shannen Doherty is sighted at The Grove on April 9, 2012 in Los Angeles, California. (Photo by Noel Vasquez/FilmMagic)
WATCH WHAT HAPPENS LIVE -- Pictured: Shannen Doherty -- (Photo by: Peter Kramer/Bravo/NBCU Photo Bank via Getty Images)
LOS ANGELES, CA - MAY 10: Shannen Doherty attends STK Los Angeles' 3 Year Anniversary Party at STK on May 10, 2011 in Los Angeles, California. (Photo by Todd Williamson/WireImage)
LOS ANGELES, CA - DECEMBER 14: Shannen Doherty signs copies of her new book 'Badass' at Barnes & Noble bookstore at The Grove on December 14, 2010 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
Shannen Doherty arrives at the Los Angeles premiere of 'Burning Palms' held at ArcLight Cinemas on January 12, 2011 in Hollywood, California.
NEW YORK - NOVEMBER 02: Actress Shannen Doherty promotes 'Badass' at Borders Books & Music, Columbus Circle on November 2, 2010 in New York City. (Photo by Jason Kempin/Getty Images)
Shannen Doherty celebrates the grand opening of Bravada Women's Athletica at Bravada - Women's Athletica on June 17, 2010 in Los Angeles, California. (Photo by Jean Baptiste Lacroix/WireImage)
NEW YORK - APRIL 01: Dancer Mark Ballas (L) and television personality Shannen Doherty pose for photos in Midtown Manhattan on April 01, 2010 in New York City. (Photo by Ray Tamarra/Getty Images)
LOS ANGELES, CA - MARCH 27: Shannen Doherty attends Perez Hilton's 'Carn-Evil' Theatrical Freak and Funk 32nd birthday party at Paramount Studios on March 27, 2010 in Los Angeles, California. (Photo by Jean Baptiste Lacroix/WireImage)
LOS ANGELES, CA - MARCH 26: Shannen Doherty is seen on March 26, 2010 in Los Angeles, California. (Photo by Jean Baptiste Lacroix/WireImage)
LOS ANGELES, CA - JANUARY 16: Actress Shannen Doherty arrives at The Art of Elysium's 3rd Annual Black Tie Charity Gala 'Heaven' on January 16, 2010 in Los Angeles, California. (Photo by Jeffrey Mayer/WireImage)
LOS ANGELES, CA - DECEMBER 18: Actress Shannen Doherty arrives at Flaunt Magazine's 10th Anniversary Party and Annual Holiday Toy Drive at the Wayne Kao Mansion on December 18th, 2008 in Holmby Hills, CA. (Photo by Michael Bezjian/WireImage)
PASADENA, CA - JULY 11: Actress Shannen Doherty speaks during the 2006 Summer Television Critics Press Tour for the Oxygen Network at the Ritz Carlton Hotel July 11, 2006 in Pasadena, California. (Photo Frederick M. Brown/Getty Images)
NEW YORK - NOVEMBER 3: (ITALY OUT, NY DAILY NEWS OUT, NY NEWSDAY OUT) Actress Shannen Doherty attends the Fendi Flagship store opening November 3, 2005 in New York City. (Photo by Arnaldo Magnani/Getty Images)
Shannen Doherty during DKNY Jeans Presents Vanity Fair in Concert With a Live Performance by Alanis Morissette Benefiting Step Up Women's Network at Hiro Ballroom at The Maritime Hotel in New York City, New York, United States. (Photo by Jamie McCarthy/WireImage)
Shannen Doherty during Olympus Fashion Week Fall 2005 - Sweetface by Jennifer Lopez and Andy Hilfiger - Backstage Arrivals at The Tent, Bryant Park in New York City, New York, United States. (Photo by KMazur/WireImage)
Shannen Doherty at the HP Portrait Studio in Park City, Utah (Photo by Jeff Vespa/WireImage)
Shannen Doherty (Photo by Jeffrey Mayer/WireImage)
Shannen Doherty during The 56th Annual Primetime Emmy Awards - Fox After Party - Arrivals at Spago in Beverly Hills, California, United States. (Photo by J.Sciulli/WireImage for The jLINE Group, Inc.)
Shannen Doherty during World Premiere of 'S.W.A.T.' at Mann Village Theater in Westwood, California, United States. (Photo by Jon Kopaloff/FilmMagic)
Shannen Doherty (Photo by Ron Galella/WireImage)
Jason Priestley, Shannen Doherty and Luke Perry (Photo by Ron Galella/WireImage)
394962 09: ***EXCLUSIVE*** (Publicist Approval Required for ALL Usage) Actress Shannen Doherty poses for a portrait January 2001 in Los Angeles, CA. (Photo by Jeff Katz/Getty Images) (Clients must call or email Getty Images with EXACT frame number, client name, name/type of publication, date of intended publication and type of usage (cover, inside full page, etc) and WAIT for Getty Images to confirm publicist approval before allowing client to commit these images to use.)
Shannen Doherty, circa 1988. (Photo by Getty Images)
Actresses Shannen Doherty and Shalane McCall attend Starlight Foundation Benefit on September 22, 1988 at Ed Debevic's Restaurant in Beverly Hills, California.
LITTLE HOUSE ON THE PRAIRIE -- Season 9 -- Pictured: Shannen Doherty as Jenny Wilder (Photo by Frank Carroll/NBC/NBCU Photo Bank via Getty Images)
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"Cancer is not pleasant but it can bring out the best in relationships or the worse," she continued. "Thankfully, it has made our marriage stronger."

WATCH: Shannen Doherty Reveals How 'Beverly Hills, 90210' Foreshadowed Her Breast Cancer Battle

After receiving a breast cancer diagnosis in February 2015, Doherty revealed to ET that the disease has spread to her lymph nodes. So far, she's undergone three out of eight rounds of chemotherapy and had a single mastectomy back in May.

Recently, Doherty sat down with ET where she opened up about the effect her cancer has had on her relationship with Iswarienko, sharing, "It's made my marriage a thousand times stronger." Check out the emotional interview below.

EXCLUSIVE: Shannen Doherty Opens Up to ET About Her Breast Cancer Battle

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