'Duck Dynasty's Rebecca Robertson Wedding Update: Sadie, Bella Robertson 'Can't Wait' to Be Bridesmaids

Jan 18, 2016 12:54 PM EST

Rebecca Robertson, the adopted daughter of "Duck Dynasty" stars Willie and Korie, can't wait for her upcoming wedding, and has asked two of her sisters -- Sadie and Bella Robertson -- to stand beside her on her special day.

The three sisters appear in a cute Instagram photo shared on Sunday, and Sadie and Bella are shown holding Starbucks cups emblazoned with the words, "Will you be my bridesmaid?"

"'Sadie with a side of will you be my bridesmaid'" OF COURSE," Sadie, 18, captioned the photo. "I can't wait to stand by your side on the most special day of your life to begin your journey with your handsome man."

Earlier in January, Rebecca announced her and her boyfriend of one year, John Reed Loflin, would be tying the knot after Loflin popped the question while the two were out searching for shells on the beach.

He proposed with a beautiful and unusual 14-carat gold Art Deco ring with a large opal in its center, which happens to be both Rebecca's birth and favorite stone. The couple told People Magazine that they already have big plans for their future, aiming to get married this year and start their family right away.

As reported by the Gospel Herald, Rebecca came to the Robertson family as an exchange student from Taiwan, and eventually, Willie and Korie took her in full-time as a foster child when she was just 14 years old. She currently runs Duck and Dressing, a boutique that she and Korie opened together in Monroe, Louisiana, and also joined the cast of Duck Dynasty in season five.

Various members of the large "Duck Dynasty" clan have taken to social media over the past several weeks to voice their excitement over the upcoming wedding.

Wrote Korie, "@rebeccalorobertson is engaged!! 2016 is shaping up to be a fun one! Excited for @johnreedloflin to join the fam! Love y'all!"

Sadie also shared a sweet picture of the couple on her personal Instagram page and included the caption, "MY SISTER IS GETTING MARRIED TO HER BEST FRIEND!!! I'm so happy for you Rebecca. John Reed... good luck joining our crazy family. So excited for y'all to beginning y'alls journey of life together."

Although eager for the future, Rebecca said she's going to take her time planning her wedding to make sure every detail is just right.

"We are thinking nine months to a year," she revealed to US weekly earlier this month. "That way we can calmly plan everything and go over fine details that we want. ...We are beyond happy and thankful for our family for leading up to this chapter of our lives, and we are so excited to see what God has in store for our future."