Jessica Biel on what makes her marriage to Justin Timberlake work: 'We believe in honesty, loyalty'


Jessica Biel and husband Justin Timberlake have plenty in common where it counts.

The stunning 35-year-old actress covers Marie Claire's August issue, in which she opens up about their enviable relationship. Biel says shared values and a strong work ethic is what keeps them together.

"We have similar values; we believe in loyalty, honesty," Biel tells the magazine. "We like to have fun. We like a lot of the same things. Also, in the business, we're all very career-oriented, and you have to be a little selfish. I understand that about my peers -- about being focused and driven -- and if you can find that and someone who shares the same values as you, it's like: Score!"

WATCH: EXCLUSIVE: Jessica Biel Opens Up About How She and Husband Justin Timberlake Inspire Each Other

Biel and 36-year-old Timberlake are parents to their adorable son, 2-year-old Silas, and the actress admits life has definitely changed since becoming a mother.

"You think you're a selfless person, and then you realize you're not," she says. "These little people come around, and they require so much, and your schedule is really not your own, nor is it important anymore, and it's very clear that it's your life now revolving around this dude. I'm not that person who feels like, 'Oh, my whole life changes for my kid,' but it does."

Still, the busy star is still making time for projects she's passionate about, including USA's The Sinner, a psychological thriller based on Petra Hammesfahr's best-selling novel. Biel plays Cora, a young American mother, who stabs a stranger to death while she's with her family at the beach. Biel says exploring her dark side for the role has been good for her.

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Jessica Biel and Justin Timberlake
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Jessica Biel and Justin Timberlake
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NEW YORK, NY - NOVEMBER 11: (Exclusive Coverage) Musician/actor Justin Timberlake (L) and actress Jessica Biel attend the GQ Men of the Year dinner on November 11, 2013 in New York City. (Photo by Kevin Mazur/Getty Images for GQ)
LAS VEGAS, NV - SEPTEMBER 18: Singer/actor Justin Timberlake (L) and actress Jessica Biel arrive at the world premiere of Twentieth Century Fox and New Regency's film 'Runner Runner' at Planet Hollywood Resort & Casino on September 18, 2013 in Las Vegas, Nevada. (Photo by Steven Lawton/FilmMagic)
NEW YORK, NY - SEPTEMBER 09: Justin Timberlake and Jessica Biel attend the 2013 US Open at USTA Billie Jean King National Tennis Center on September 9, 2013 in New York City. (Photo by Uri Schanker/WireImage)
NEW YORK, NY - SEPTEMBER 09: Justin Timberlake and Jessica Biel attend the 2013 US Open at USTA Billie Jean King National Tennis Center on September 9, 2013 in New York City. (Photo by Uri Schanker/WireImage)
CANNES, FRANCE - MAY 19: Justin Timberlake and Jessica Biel attend the Premiere of 'Inside Llewyn Davis' at The 66th Annual Cannes Film Festival on May 19, 2013 in Cannes, France. (Photo by Venturelli/WireImage)
CANNES, FRANCE - MAY 19: Jessica Biel and Justin Timberlake attend the Premiere of 'Inside Llewyn Davis' at The 66th Annual Cannes Film Festival on May 19, 2013 in Cannes, France. (Photo by George Pimentel/WireImage)
BEVERLY HILLS, CA - OCTOBER 05: Actors Jessica Biel and Justin Timberlake attend Variety's 4th Annual Power of Women Event Presented by Lifetime at the Beverly Wilshire Four Seasons Hotel on October 5, 2012 in Beverly Hills, California. (Photo by Michael Kovac/WireImage)
NEW YORK, NY - MAY 05: (Exclusive Coverage) Jessica Biel and Justin Timberlake backstage after MasterCard Priceless Premieres presents Justin Timberlake at Roseland Ballroom on May 5, 2013 in New York City. (Photo by Kevin Mazur/WireImage)
NEW YORK, NY - APRIL 23: Justin Timberlake (L) and Jessica Biel attend the 2013 Time 100 Gala at Frederick P. Rose Hall, Jazz at Lincoln Center on April 23, 2013 in New York City. (Photo by D Dipasupil/FilmMagic)
NEW YORK, NY - APRIL 23: Jessica Biel and Justin Timberlake attend TIME 100 Gala, TIME'S 100 Most Influential People In The World at Jazz at Lincoln Center on April 23, 2013 in New York City. (Photo by Kevin Mazur/WireImage for TIME)
CANNES, FRANCE - MAY 20: Jessica Biel and Justin Timberlake sighted leaving Le Grand Journal studio during The 66th Annual Cannes Film Festival on May 20, 2013 in Cannes, France. (Photo by Mark Robert Milan/FilmMagic)
NEW YORK, NY - APRIL 23: Justin Timberlake and Jessica Biel attend the 2013 Time 100 Gala at Frederick P. Rose Hall, Jazz at Lincoln Center on April 23, 2013 in New York City. (Photo by Jamie McCarthy/Getty Images)
NEW YORK, NY - MARCH 14: Musician Justin Timberlake (L) and actress Jessica Biel attend Timbaland's Birthday Celebration at Southern Hospitality on March 14, 2013 in New York City. (Photo by Michael Stewart/Getty Images)
LONDON, UNITED KINGDOM - FEBRUARY 18: Jessica Biel and Justin Timberlake attend the Tom Ford show during London Fashion Week Fall/Winter 2013/14 at on February 18, 2013 in London, England. (Photo by Eamonn McCormack/Getty Images)
LOS ANGELES, CA - FEBRUARY 10: (L-R) Singer Justin Timberlake, actress Jessica Biel and singer Beyonce attend the 55th Annual GRAMMY Awards at STAPLES Center on February 10, 2013 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for NARAS)
LOS ANGELES, CA - FEBRUARY 10: Justin Timberlake and Jessica Biel attend the 55th Annual GRAMMY Awards at STAPLES Center on February 10, 2013 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for NARAS)
WEST HOLLYWOOD, CA - FEBRUARY 07: (EXCLUSIVE COVERAGE) Jessica Biel and Justin Timberlake attend Darren Le Gallo's 'Nothing You Don't Know' Exhibition hosted by Trigg Ison Fine Art, Amy Adams and Justin Timberlake at Trigg Ison Fine Arts Gallery on February 7, 2013 in West Hollywood, California. (Photo by Amy Graves/WireImage)
NEW YORK, NY - DECEMBER 05: Justin Timberlake and Jessica Biel attend the after party for the FilmDistrict and Chrysler with The Cinema Society premiere of 'Playing For Keeps' at Dream Downtown on December 5, 2012 in New York City. (Photo by Theo Wargo/WireImage)
MEMPHIS, TN - NOVEMBER 23: Recording artist and Memphis Grizzlies minority owner Justin Timberlake dances along side Jessica Biel during a game between the Memphis Grizzlies and the Los Angeles Lakers on November 23, 2012 at FedExForum in Memphis, Tennessee. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. Mandatory Copyright Notice: Copyright 2012 NBAE (Photo by Joe Murphy/NBAE via Getty Images)
BEVERLY HILLS, CA - OCTOBER 05: Actors Jessica Biel and Justin Timberlake attend Variety's 4th Annual Power of Women Event Presented by Lifetime at the Beverly Wilshire Four Seasons Hotel on October 5, 2012 in Beverly Hills, California. (Photo by Michael Kovac/WireImage)
LOS ANGELES, CA - MAY 12: Justin Timberlake smiles as Jessica Biel gives him a kiss coutside as the Los Angeles Lakers take on the Denver Nuggets in Game Seven of the Western Conference Quarterfinals in the 2012 NBA Playoffs on May 12, 2012 at Staples Center in Los Angeles, California. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Harry How/Getty Images)
Justin Timberlake and Jessica Biel attend the Costume Institute Benefit at The Metropolitan Museum of Art May 7, 2012, celebrating the opening of Schiaparelli and Prada: Impossible Conversations. AFP PHOTO / TIMOTHY A. CLARY (Photo credit should read TIMOTHY A. CLARY/AFP/GettyImages)
NEW YORK, NY - MAY 07: Jessica Biel and Justin Timberlake attend the 'Schiaparelli And Prada: Impossible Conversations' Costume Institute Gala at the Metropolitan Museum of Art on May 7, 2012 in New York City. (Photo by Dimitrios Kambouris/Getty Images)
NEW YORK, NY - MAY 07: Jessica Biel and Justin Timberlake attend the 'Schiaparelli And Prada: Impossible Conversations' Costume Institute Gala at the Metropolitan Museum of Art on May 7, 2012 in New York City. (Photo by Kevin Mazur/WireImage)
(EXCLUSIVE, Premium Rates Apply) (EXCLUSIVE ACCESS SPECIAL RATES APPLY; NO NORTH AMERICAN ON-AIR BROADCAST UNTIL MARCH 3, 2011) Jessica Biel and Justin Timberlake attend the 2011 Vanity Fair Oscar Party Hosted by Graydon Carter at the Sunset Tower Hotel on February 27, 2011 in West Hollywood, California.
(EXCLUSIVE, Premium Rates Apply) (EXCLUSIVE COVERAGE) Glamour Reel Moments Director Jessica Biel and singer/actor Justin Timberlake attend the 5th Anniversary of Glamour Reel Moments Presented by Hyundai at Chateau Marmont on October 25, 2010 in Los Angeles, California.
NEW YORK - MAY 03: Jessica Biel and Justin Timberlake attends 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 Kevin Mazur/WireImage)
NEW YORK - MAY 02: Justin Timberlake and Jessica Biel are seen on the streets of Manhattan on May 2, 2010 in New York, New York. (Photo by Marcel Thomas/FilmMagic)
NEW YORK - FEBRUARY 18: Jessica Biel and Justin Timberlake attend Paris68 Fall 2010 during Mercedes-Benz Fashion Week at Milk Studios on February 18, 2010 in New York City. (Photo by Bennett Raglin/WireImage)
NEW YORK - MAY 04: Justin Timberlake and Jessica Biel attends 'The Model as Muse: Embodying Fashion' Costume Institute Gala at The Metropolitan Museum of Art on May 4, 2009 in New York City. (Photo by Randy Brooke/WireImage)
LOS ANGELES, CA - APRIL 21: Actors Jessica Biel and Justin Timberlake smile from their courtside seats during the Los Angeles Lakers and the Utah Jazz Game Two of the Western Conference Quarterfinals during the 2009 NBA Playoffs at Staples Center on April 21, 2009 in Los Angeles, California. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Lisa Blumenfeld/Getty Images)
LOS ANGELES, CA - APRIL 21: Justin Timberlake (R) and Jessica Biel (L) kiss at the Los Angeles Lakers vs Utah Jazz game at Staples Center on April 21, 2009 in Los Angeles, California. (Photo by Noel Vasquez/Getty Images)
(EXCLUSIVE, Premium Rates Apply) HOLLYWOOD - DECEMBER 10: ***EXCLUSIVE*** Jessica Biel and Justin Timberlake during Jessica Biel & Make The Difference Network Partner with Auction Cause to Benefit Childrens Hospital Los Angeles at Social Hollywood in Hollywood, CA on December 10, 2008. (Photo by Chris Polk/FilmMagic)
NEW YORK, NY - SEPTEMBER 09: Justin Timberlake and Jessica Biel attend the 2013 US Open at USTA Billie Jean King National Tennis Center on September 9, 2013 in New York City. (Photo by Uri Schanker/WireImage)
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"I have challenges standing up for myself sometimes," she explains. "Times when I don't trust my own voice. And that's the stuff I needed to bring out and explore to understand Cora."

"It's like a drug, like an adrenaline rush," she adds. "There's a real catharsis...you're exhausted, you are free; you feel a lot of different things. For me, it's like a rebirth. Like I'm a phoenix rising up out of the ashes."

WATCH: Jessica Biel Shares Hilarious Advice for Aspiring Models in Instagram #TBT

ET spoke to Biel at the Tribeca Film Festival, where she talked about her dark role in The Sinner, which premieres on Aug. 2 on USA.

43 PHOTOS
Jessica Biel Style Transformation
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Jessica Biel Style Transformation

July 1998

Jessica attends the "Halloween H20" premiere, showing off those pesky tan lines once again.

Photo Credit: Jim Smeal, WireImage/Getty Images

July 1998

Jessica attends the

July 1998

Biel chooses a much more casual outfit for the

September 1998

Jessica wore a leather jacket to the premiere of

November 1998

At the First Annual TV Guide Awards, Jessica went for all black - from her eyes to her heels!

Photo Credit: Jim Smeal, WireImage

August 1999

Biel chose a super casual look for the Teen Choice Awards: a plain white tank!

Photo Credit: Jim Smeal, WireImage
 

August 2001

Jessica matched her shoes to her dress at the premiere of "Summer Catch."

Photo Credit: Ron Galella, WireImage

October 2002

We love the new darker shade of Jessica's hair here at the "Rules of Attraction" premiere.

Photo Credit: Gregg DeGuire, WireImage

June 2003

It's all about comfort as Jessica walks her pup in bright green sneakers.

Photo Credit: Animal Fair Media, Getty Images

October 2001

Jessica and then boyfriend Chris Evans were no-fuss at this party for PlayStation.

Photo Credit: Gregg DeGuire, WireImage

September 2004 

Jessica wore this pretty aqua embellished dress to the premiere of "Cellular."

Photo Credit: Getty Images

December 2004

A visit to MTV’s TRL brought out embellished shoulders, and we're loving it!

Photo Credit: Getty Images

July 2005

Jessica's hair and dress are all glam at the “Stealth” premiere.

Photo Credit: Jon Kopaloff, Film Magic

January 2006

Biel was stunning in this black gown at a Golden Globes after party.

Photo Credit: Frazer Harrison, Getty Images

October 2006

We can see the fashionista emerging at the premiere of “Texas Chainsaw Massacre: The Beginning."

Photo Credit: Michael Buckner, Getty Images

November 2006

Jessica wore this gorgeous nude dress to the GQ Man of the Year Awards.

Photo Credit: L. Cohen, WireImage

February 2009

Biel is a vision in pink and red at the “Valentines Day” premiere.

Photo Credit: Lester Cohen, WireImage

March 2010 

We love this look: from the patterned dress to the black accents, and that perfect pop of pink for lipstick!

Photo Credit: Getty Images

October 2011

There is a LOT going on with these shoulders on Jessica's dress at the 28th Annual Night of Stars.

Photo Credit: Getty Images

January 2012

The pale shade of this dress looks divine against Biel's dark hair at the Golden Globes.

Photo Credit: Getty Images

August 2012

Jessica looked stunning while visiting “Good Morning America.”

Photo Credit: D. Dipasupil, Getty Images

August 2012

At the premiere for “Total Recall,” Jessica was sweet in pink.

Photo Credit: Getty Images

August 2012 

Bold and backless, Biel looked gorgeous in Berlin.

Photo Credit: Getty Images

September 2012

Biel was radiant in a white shimmering feathered dress at the London "Total Recall" premiere.

Photo Credit: AFP/Getty Images

November 2012

Jessica attended Variety's 4th Annual Power Of Women Event, wearing this stunning blue and green floral dress.

Photo Credit: Getty Images

November 2012

Never afraid to take risks, Biel wore this sparkling ensemble to the "Hitchcock" Premiere in New York City. 

Photo Credit: Jim Spellman/WireImage

December 2012

Biel wore this elegant black gown to the "Hitchcock" premiere at the Academy of Art and Motion.

Photo Credit: Lester Cohen, WireImage/Getty Images

February 2013

Jessica attends the "Playing for Keeps" Premiere in New York City, looking absolutely radiant in this gorgeous gown.

Photo Credit: Theo Wargo/WireImage

February 2013

Jessica and husband Justin Timberlake are a stunning couple, attending Tom Ford's show at London Fashion Week.

Photo Credit: Samir Hussein/WireImage

January 2012

The pale shade of this dress looks divine against Biel

May 2012

Biel debuts her new bangs, and looks gorgeous in this white dress with green embellishment.

Photo Credit: Getty Images

July 2012

Jessica wore this short dress to the ESPY Awards, and we love the pop of yellow in her shoes!

Photo Credit: Getty Images

August 2012

Jessica looked stunning while visiting

August 2012

At the premiere for

August 2012

September 2012

Biel was

November 2012

Jessica attended Variety

November 2012

Never afraid to take risks, Biel wore this sparkling ensemble to the

November 2012

Biel visits David Letterman, looking nothing like a bruise in this black and blue outfit!

Photo Credit: Getty Images

December 2012

Biel wore this elegant black gown to the

February 2013

Jessica attends the

February 2013

Jessica and husband Justin Timberlake are a stunning couple, attending Tom Ford

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