• "Duck Dynasty" star Bella Robertson announced her engagement to boyfriend Jacob Mayo on Instagram
  • Mayo shared photos from the night he proposed
  • Bella's sister, Sadie, welcomed Mayo into the family and shared photos from the engagement celebration

"Duck Dynasty" star Bella Robertson is engaged to her boyfriend, Jacob Mayo, just six months after they started dating.

On Saturday, Robertson, 18, shared a sweet black-and-white photo booth image from their engagement celebration on Instagram with the words, "She said yes!"

"I was thankful for you yesterday, I am thankful for you today, and now I get to be thankful for you for the rest of my life! I am blown away by Gods goodness and grace. @jacobdmayo lets get married!! I love you forever," she captioned the snap.

Robertson received well-wishes and congratulatory messages from her friends and followers following the announcement.

"Congratulations Bella!!!!! You are going to be a beautiful bride!!!" Victoria Robinson commented. "Congratulations Bella and Jacob!" Candace Cameron Bure wrote.

"When Bella finally picks Jacob," one fan commented, referring to the love triangle between Bella, Edward and Jacob in the blockbuster "Twilight" books and movies.

Mayo also shared photos of his proposal on Instagram. In one snap, Robertson has a blindfold on and there are white petals on the ground, while another picture shows Mayo on bended knee while showing his now-fiancée the ring. The newly engaged couple then kiss and embrace each other in the next images.

"Engaged!" Mayo wrote in the caption. "Bella is many things to me. She is my best friend. She is the person I can lean on in any problem with no judgment. But with the honest truth when I’m acting out."

Mayo also mentioned how Robertson influenced his spiritual side.

"She loves Jesus. She holds me to a higher standard that she doesn’t let waver," he added. "She unconditionally loves me whether I’m doing what she likes or the opposite side of the spectrum. She’s the one for me forever. She’s my everything. I thank God for her. #tothemayos."

Meanwhile, Bella's older sister, Sadie Robertson, congratulated the newly engaged couple. Sadie, who is expecting her first baby with her husband Christian Huff, shared several family and group photos from the engagement celebration on social media.

"HOW IS MY LITTLE SISTER ENGAGED?!? I thought you were still 7?!?" she wrote in the caption. "But as wild as this is to me I’m thankful it’s to such a good man like Jacob. We can’t wait to welcome you into this crazy family even though I kind of already feel like you are a part of it [red heart emojoi] bella, you have always had the best heart and you’re going to be the most incredible wife."

Their mother, Korie, also showered Mayo and Bella with lots of love.

"Our fam is growing again @bellarobb got engaged last night to the sweetest man @jacobdmayo My baby girl all the emotions!!" she wrote.

She continued, "Jacob, we love you and are so excited to welcome you into the fam. It’s been so much fun to see your love story unfold. From coming around for tennis, to family trips, to us all growing to love you. Together, you two are a strong, kind, fun, generous, grace-filled, bright light in the world. Also, 2021 is going to be so much fun."

Duck Dynasty star Bella Robertson LAS VEGAS, NV - APRIL 08: Bella Robertson arrives at the "Duck Commander Musical" opening night at the Rio Hotel & Casino on April 15, 2015 in Las Vegas, Nevada. Photo: Mindy Small/FilmMagic