EXCLUSIVE: 'Duck Dynasty's Sadie Robertson sweetly gushes over new relationship with college QB Trevor Knight

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Cute new couple alert!

While rumors surrounding Sadie Robertson and Texas A&M quarterback Trevor Knight have been swirling online, the Duck Dynasty star confirms new details about their relationship exclusively to ET.

"We've been dating for three weeks, so it's super chill," Robertson said, sitting down in ET's Burbank, California, studio on Monday. But the duo has been friendly for a few months now, popping up fairly frequently in each other's Instagram feeds.

WATCH: 'Duck Dynasty' Stars Willie and Korie Robertson Get Candid on Disciplining Kids

"He had messaged me because he goes to Haiti every year on a mission trip and he saw that I go to Haiti," she explained. "We just kinda connected through that, very much friends at first."

Then, Sadie's best friend (and her cousin Reed Robertson's fiancee, Brighton Thompson) had to bail on a planned girls night at a Justin Bieber concert.

WATCH: Why Sadie Robertson Attended Prom With Her Cousin, Cole

"Trevor lives in Texas and he was messaging me, and I was like, 'Uh, do you want to go to a Justin Bieber concert with me? Because I don't have anybody to go with.' And he was like, 'Sure.' So, he came and I guess we just hit it off," Sadie recalled. But not well enough, apparently, to make it official.

"We didn't date then. Actually, I didn't talk to him for a month after that. I was like, 'No,'" the 19-year-old admitted. "Then a month later he called me and was like, 'So, why didn't you just talk to me for a month?' And we ended up becoming friends and, of course, started dating three weeks ago."

Sadie's mom, Korie Robertson, gave Trevor two thumbs up when asked for her review, and Sadie said that he's already met the whole Duck Dynasty clan.

"My family's a little scary and a little intimidating -- they're big LSU fans and he plays for Texas A&M -- so that was kinda funny, but he's a good guy," she said. "Even Pepaw Phil was nice!"

WATCH: Sadie Robertson Reveals Why Her Feature Film Debut Was the 'Perfect' Part

But when it comes to the Robertsons' reality TV fame, Trevor didn't bat an eyelash.

"Trevor has to deal with his own kinda fame -- that was weird for me," Sadie said. "We're both kinda in the spotlight ... but he does such a good job with it. He is a very strong Christian and he tells everybody about his faith, so we had a lot in common in that area."

As her new beau gears up for football season, Sadie is ready to hit the road on her Live Original Tour, bringing some of her famous family members along for the ride. Joining Sadie on her 17-city trek are John Luke and Mary Kate Robertson, Reed Robertson and Brighton Thompson, and Cole Robertson.

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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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"It's gonna be fun, but it's also gonna be really life-changing," Sadie said. "I think people are gonna feel really inspired and leave there feeling like they can really make an impact in the world."

As for Sadie, when she's not writing books, offering inspiration to her peers, or designing her own fashion line, she's on Maid of Honor duty for Reed and Brighton.

"Brighton was just texting me like, 'We have to plan the bachelorette party!'" she said with a laugh. "We're kinda all underage, so it's probably not like most people's bachelorette parties. I think we're gonna go out to her family camp and get people to come in and do massages and stuff, so very relaxing."

WATCH: Jep and Jessica Robertson Introduce Their Newly Adopted Baby Boy

She'll also play bridesmaid at her sister Rebecca's tropical wedding later this year. "That girl is all over the place," Sadie teased. "She finally got her bridesmaids dresses in, so that's good. We're moving in the right direction!"

Meanwhile, newlyweds John Luke and Mary Kate, who celebrated their first anniversary in June, may be holding off on taking their own next steps towards building a family.

"We're like, 'No, no, no, no, no! Slow down!'" Sadie laughed. "They have a dog, Pippa, so that's like their baby."

Live Original Tour 2016 kicks off on Sept. 22 in Allen, Texas, and will wind its way around the country before wrapping in Nashville, Tennessee, on Oct. 16. Tickets are available now.

Watch Sadie's full interview with ET in the player below.

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