EXCLUSIVE: Sadie Robertson reveals why her feature film debut was the 'perfect' part, dishes on sister's upcoming wedding

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Sadie Robertson has been a fixture on her family's reality show, Duck Dynasty, for years, but the fashion designer and reality star makes her feature film debut in the new faith-based drama, God's Not Dead 2.

"It was so cool," Sadie, 18, gushed to ET at the film's premiere last week. "I've been kind of easing my way into movies and this was the perfect way to do it, with something that means something to me."

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The Robertsons have always been outspoken about their strong Christian beliefs, and Sadie's mother Korie told ET that faith is what gets the family through "the good times and the bad times."

"It's not something that likes, 'Oh it's there on Sunday then it's not there,'" Korie explained. "I think it permeates every part of our life."

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EXCLUSIVE: Sadie Robertson reveals why her feature film debut was the 'perfect' part, dishes on sister's upcoming wedding
This image released by Starpix shows TV personality Sadie Robertson from the A&E series "Duck Dynasty," backstage at the Sherri Hill Fashion Show, Monday, Sept. 9, 2013, in New York. Robertson modeled several designs as her family looked on from the front row. (AP Photo/Starpix, Marion Curtis)
NASHVILLE, TN - JUNE 08: Sadie Robertson attends the 2016 CMT Music awards at the Bridgestone Arena on June 8, 2016 in Nashville, Tennessee. (Photo by C Flanigan/WireImage)
NASHVILLE, TN - JUNE 08: Television personality Sadie Robertson attends the 2016 CMT Music awards at the Bridgestone Arena on June 8, 2016 in Nashville, Tennessee. (Photo by John Shearer/WireImage)
WASHINGTON, DC - APRIL 16: Sadie Robertson attends the inaugural DC RARE Under 40 Awards at Hotel Palomar on April 16, 2016 in Washington, DC. (Photo by Kris Connor/Getty Images for Rare)
LOS ANGELES, CA - MARCH 21: Reality TV Personality Sadie Robertson attends the premiere of 'God's Not Dead 2' at Directors Guild Of America on March 21, 2016 in Los Angeles, California. (Photo by Paul Archuleta/FilmMagic)
LOS ANGELES, CA - MARCH 21: Sadie Robertson and Korie Robertson attend the premiere of Pure Flix Entertainment's 'God's Not Dead 2' at Directors Guild Of America on March 21, 2016 in Los Angeles, California. (Photo by Araya Diaz/WireImage)
UNIVERSAL CITY, CA - FEBRUARY 05: Reality TV Personality Sadie Robertson attends the 24th Annual Movieguide Awards Gala at Universal Hilton Hotel on February 5, 2016 in Universal City, California. (Photo by Paul Archuleta/Getty Images)
UNIVERSAL CITY, CA - FEBRUARY 05: Reality TV Personality Sadie Robertson attends the 24th Annual Movieguide Awards Gala at Universal Hilton Hotel on February 5, 2016 in Universal City, California. (Photo by Paul Archuleta/Getty Images)
NASHVILLE, TN - OCTOBER 13: Host Sadie Robertson and Gloria Gaynor speak onstage during the 46th Annual GMA Dove Awards at Allen Arena, Lipscomb University on October 13, 2015 in Nashville, Tennessee. (Photo by John Shearer/Getty Images for Dove Awards)
NEW YORK, NY - SEPTEMBER 13: TV personality Sadie Robertson walks the runway at the Sherri Hill fashion show during Spring 2016 New York Fashion Week: The Shows at The Plaza on September 13, 2015 in New York City. (Photo by Michael Stewart/FilmMagic)
NEW YORK, NY - SEPTEMBER 13: TV personality Sadie Robertson walks the runway at the Sherri Hill fashion show during Spring 2016 New York Fashion Week: The Shows at The Plaza on September 13, 2015 in New York City. (Photo by Michael Stewart/FilmMagic)
LOS ANGELES, CA - MARCH 29: (L-R) TV personalities Lil Will Robertson, Korie Robertson, Bella Robertson, Willie Robertson, Sadie Robertson and John Luke Robertson from Duck Dynasty attend Nickelodeon's 27th Annual Kids' Choice Awards at USC Galen Center on March 29, 2014 in Los Angeles, California. (Photo by David Livingston/Getty Images)
Snap by Bethany Mota
DANCING WITH THE STARS - 'Episode 1903' - Eleven remaining couples competed during 'Movie Night,' as they danced to songs from their favorite movies, on 'Dancing with the Stars,' MONDAY, SEPTEMBER 29, on the ABC Television Network. Kevin Hart, from 'Ride Along,' 'Think Like a Man' and the upcoming movie 'The Wedding Ringer,' guest judged alongside Carrie Ann Inaba, Julianne Hough and Bruno Tonioli. Monday's show kicked-off with a spectacular opening number featuring the entire cast. (Photo by Adam Taylor/ABC via Getty Images) MARK BALLAS, SADIE ROBERTSON
DANCING WITH THE STARS - 'Episode 1903' - Eleven remaining couples competed during 'Movie Night,' as they danced to songs from their favorite movies, on 'Dancing with the Stars,' MONDAY, SEPTEMBER 29, on the ABC Television Network. Kevin Hart, from 'Ride Along,' 'Think Like a Man' and the upcoming movie 'The Wedding Ringer,' guest judged alongside Carrie Ann Inaba, Julianne Hough and Bruno Tonioli. Monday's show kicked-off with a spectacular opening number featuring the entire cast. (Photo by Adam Taylor/ABC via Getty Images) MARK BALLAS, SADIE ROBERTSON
DANCING WITH THE STARS - 'Episode 1903' - Eleven remaining couples competed during 'Movie Night,' as they danced to songs from their favorite movies, on 'Dancing with the Stars,' MONDAY, SEPTEMBER 29, on the ABC Television Network. Kevin Hart, from 'Ride Along,' 'Think Like a Man' and the upcoming movie 'The Wedding Ringer,' guest judged alongside Carrie Ann Inaba, Julianne Hough and Bruno Tonioli. Monday's show kicked-off with a spectacular opening number featuring the entire cast. (Photo by Adam Taylor/ABC via Getty Images) SADIE ROBERTSON, MARK BALLAS
DANCING WITH THE STARS - 'Episode 1903' - Eleven remaining couples competed during 'Movie Night,' as they danced to songs from their favorite movies, on 'Dancing with the Stars,' MONDAY, SEPTEMBER 29, on the ABC Television Network. Kevin Hart, from 'Ride Along,' 'Think Like a Man' and the upcoming movie 'The Wedding Ringer,' guest judged alongside Carrie Ann Inaba, Julianne Hough and Bruno Tonioli. Monday's show kicked-off with a spectacular opening number featuring the entire cast. (Photo by Adam Taylor/ABC via Getty Images) SADIE ROBERTSON, MARK BALLAS
DANCING WITH THE STARS - 'Episode 1903' - Eleven remaining couples competed during 'Movie Night,' as they danced to songs from their favorite movies, on 'Dancing with the Stars,' MONDAY, SEPTEMBER 29, on the ABC Television Network. Kevin Hart, from 'Ride Along,' 'Think Like a Man' and the upcoming movie 'The Wedding Ringer,' guest judged alongside Carrie Ann Inaba, Julianne Hough and Bruno Tonioli. Monday's show kicked-off with a spectacular opening number featuring the entire cast. (Photo by Adam Taylor/ABC via Getty Images) CHERYL BURKE, ANTONIO SABATO JR., LEA THOMPSON, ARTEM CHIGVINTSEV, EMMA SLATER, MICHAEL WALTRIP, SADIE ROBERTSON, MARK BALLAS
DANCING WITH THE STARS - 'Episode 1902' - It was #myjammonday this week on 'Dancing with the Stars.' The 12 remaining celebrities danced to their favorite songs on MONDAY, SEPTEMBER 22 (8:00-10:01 p.m., ET), on the ABC Television Network. Monday's show kicks-off with a spectacular opening number featuring the full cast and judges dancing to a medley of the judges' favorite songs. Each couple then performed a variety of dances, including the Cha Cha, Foxtrot, Jive and Rumba, to their favorite jam. (Photo by Adam Taylor/ABC via Getty Images) SADIE ROBERTSON, MARK BALLAS
DANCING WITH THE STARS - 'Episode 1902' - It was #myjammonday this week on 'Dancing with the Stars.' The 12 remaining celebrities danced to their favorite songs on MONDAY, SEPTEMBER 22 (8:00-10:01 p.m., ET), on the ABC Television Network. Monday's show kicks-off with a spectacular opening number featuring the full cast and judges dancing to a medley of the judges' favorite songs. Each couple then performed a variety of dances, including the Cha Cha, Foxtrot, Jive and Rumba, to their favorite jam. (Photo by Adam Taylor/ABC via Getty Images) SADIE ROBERTSON, MARK BALLAS
DANCING WITH THE STARS - 'Episode 1902' - It was #myjammonday this week on 'Dancing with the Stars.' The 12 remaining celebrities danced to their favorite songs on MONDAY, SEPTEMBER 22 (8:00-10:01 p.m., ET), on the ABC Television Network. Monday's show kicks-off with a spectacular opening number featuring the full cast and judges dancing to a medley of the judges' favorite songs. Each couple then performed a variety of dances, including the Cha Cha, Foxtrot, Jive and Rumba, to their favorite jam. (Photo by Adam Taylor/ABC via Getty Images) SADIE ROBERTSON, MARK BALLAS
DANCING WITH THE STARS - 'Episode 1902' - It was #myjammonday this week on 'Dancing with the Stars.' The 12 remaining celebrities danced to their favorite songs on MONDAY, SEPTEMBER 22 (8:00-10:01 p.m., ET), on the ABC Television Network. Monday's show kicks-off with a spectacular opening number featuring the full cast and judges dancing to a medley of the judges' favorite songs. Each couple then performed a variety of dances, including the Cha Cha, Foxtrot, Jive and Rumba, to their favorite jam. (Photo by Adam Taylor/ABC via Getty Images) FOREGROUND: TOM BERGERON, SADIE ROBERTSON, MARK BALLAS
DANCING WITH THE STARS - 'Episode 1902' - It was #myjammonday this week on 'Dancing with the Stars.' The 12 remaining celebrities danced to their favorite songs on MONDAY, SEPTEMBER 22 (8:00-10:01 p.m., ET), on the ABC Television Network. Monday's show kicks-off with a spectacular opening number featuring the full cast and judges dancing to a medley of the judges' favorite songs. Each couple then performed a variety of dances, including the Cha Cha, Foxtrot, Jive and Rumba, to their favorite jam. (Photo by Adam Taylor/ABC via Getty Images) MARK BALLAS, SADIE ROBERTSON
DANCING WITH THE STARS - 'Episode 1902' - It was #myjammonday this week on 'Dancing with the Stars.' The 12 remaining celebrities danced to their favorite songs on MONDAY, SEPTEMBER 22 (8:00-10:01 p.m., ET), on the ABC Television Network. Monday's show kicks-off with a spectacular opening number featuring the full cast and judges dancing to a medley of the judges' favorite songs. Each couple then performed a variety of dances, including the Cha Cha, Foxtrot, Jive and Rumba, to their favorite jam. (Photo by Adam Taylor/ABC via Getty Images) SADIE ROBERTSON, MARK BALLAS
DANCING WITH THE STARS - 'Episode 1902' - It was #myjammonday this week on 'Dancing with the Stars.' The 12 remaining celebrities danced to their favorite songs on MONDAY, SEPTEMBER 22 (8:00-10:01 p.m., ET), on the ABC Television Network. Monday's show kicks-off with a spectacular opening number featuring the full cast and judges dancing to a medley of the judges' favorite songs. Each couple then performed a variety of dances, including the Cha Cha, Foxtrot, Jive and Rumba, to their favorite jam. (Photo by Adam Taylor/ABC via Getty Images) SADIE ROBERTSON, MARK BALLAS
NEW YORK, NY - SEPTEMBER 09: The Robertson family of 'Duck Dynasty' watch Sadie Robertson walk in the Evening By Sherri Hill fashion show during Mercedes-Benz Fashion Week Spring 2014 at Trump Tower on September 9, 2013 in New York City.Ê (Photo by Monica Schipper/Getty Images)
NEW YORK, NY - SEPTEMBER 09: The Robertson family of 'Duck Dynasty' watch Sadie Robertson walk in the Evening By Sherri Hill fashion show during Mercedes-Benz Fashion Week Spring 2014 at Trump Tower on September 9, 2013 in New York City.Ê (Photo by Monica Schipper/Getty Images)
NEW YORK, NY - NOVEMBER 28: (L-R) TV personalities Willie Robertson, Korie Robertson and Sadie Robertson of Duck Dynasty attends the 87th annual Macy's Thanksgiving Day parade on November 28, 2013 in New York City. (Photo by Michael Stewart/WireImage)
Duck Dynasty's Sadie Robertson, left, holds her hand to her heart as her aunt Missy Robertson sings the national anthem before the start of a rain delayed NASCAR Sprint Cup Series auto race at Texas Motor Speedway in Fort Worth, Texas, Sunday, April 6, 2014. (AP Photo/Mike Stone)
NEW YORK, NY - FEBRUARY 12: TV personalities Korie Robertson (L) and Sadie Robertson attend the Sherri Hill Fall 2016 fashion show at Gotham Hall on February 12, 2016 in New York City. (Photo by Michael Stewart/WireImage)
NEW YORK, NY - FEBRUARY 12: Sadie Robertson poses during the Sherri Hill Fall 2016 fashion show during New York Fashion Week: The Shows on February 12, 2016 in New York City. (Photo by D Dipasupil/Getty Images for NYFW: The Shows)
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For Sadie, her faith helped her through an impressive run on Dancing With the Stars' 19th season, in which the reality star finished as the runner-up behind Alfonso Ribeiro.

"Without that faith during that show, I definitely couldn't have made it through," she admitted. "It was just a crazy experience and God just really took me the whole way."

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The model and actress is also leaning on her faith and family as she deals with a recent split from longtime boyfriend Blake Coward. According to her mom, however, Sadie is keeping focused on her career.

"She's gonna focus on this movie, and on what we're doing with Duck Dynasty, and all the amazing opportunities she's got going on right now," Korie told ET.

Next up for the whole Robertson family: a wedding! Sadie's older sister Rebecca is set to tie the knot later this year, though the clan is staying tight-lipped about details.

"She's going to do a destination wedding. We can't tell where but it will be this year," Korie revealed. "The whole family is really excited about it."

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