By Dave Quinn, People
December 20, 2017

It’s official!  and boyfriend  are expecting their first child together, the reality star confirmed.

“My greatest dream realized,” Kardashian wrote on Instagram alongside a bump picture. “We are having a baby! I had been waiting and wondering but God had a plan all along. He knew what He was doing. I simply had to trust in Him and be patient.”

She continued, “I still at times can’t believe that our love created life! Tristan, thank you for loving me the way that you do! Thank you for treating me like a Queen! Thank you for making me feel beautiful at all stages! Tristan, most of all, Thank you for making me a MOMMY!!! You have made this experience even more magical than I could have envisioned! I will never forget how wonderful you’ve been to me during this time! Thank you for making me so happy my love!”

“Thank you to everyone for the love and positive vibes! I know we’ve been keeping this [quiet] but we wanted to enjoy this between our family and close friends as long as we could privately. To enjoy our first precious moments just us. Thank you all for understanding. I am so thankful, excited, nervous, eager, overjoyed and scared all in one! But it’s the best bundle of feelings I’ve ever felt in my life! ”

PEOPLE first broke the news back in September that Kardashian, 33, and Thompson, 26, . Multiple sources confirmed in late October that they will  together in early 2018. Thompson also has a 1-year-old son named  from a previous relationship with his ex-girlfriend .

“They are absolutely thrilled,” a source revealed to PEOPLE in September of the couple. “This isn’t something they were in a rush to announce to the whole world, and it’s only been in just the past week or so telling most of their inner circle.”

“This is something Khloé has wanted for years and years and yet it’s more than that: She didn’t want it unless she was  for it,” the insider said, adding, “This is such a wonderful moment for her: not only is she going to be a mother, she is going to be raising a child with . Everyone is over the moon for them both.”

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Kardashian isn’t the only one in the family expecting a child. Her pregnancy news came days after sources confirmed to PEOPLE that sister  and boyfriend  are . She is due in February.

Sister  and husband  are also expecting  — after hiring  them expand their family.

Jenner, 20, has yet to confirm her baby news, while a Dec. 13 Keeping Up with the Kardashians  the family may finally reveal Kardashian’s baby news. Kardashian West, 37,  about her little one on the way in the 10-year-anniversary season trailer for the show.

Kardashian and Thompson, a center/power forward for the Cleveland Cavaliers, first  in early September 2016 and have been spending  since then in Cleveland — even celebrating ,  and  there together last year. They then  with one another.

Ahead of  this year — — the star used  to share some of the things she’s grateful for. “Believe me, I know how truly blessed I am,” Kardashian said. “I thank God every day for this life. It’s important to remember your blessings all year long, but Thanksgiving is a good time to take a moment and be appreciative.”

Of course, it comes as no surprise that Thompson is top of the list. “I am and all that he has brought into my life!” she praised the Cleveland Cavaliers player, whom she has been dating for over a year. “He has been and has given me a new level of happiness and love.”

Though Kardashian and Thompson aren’t yet engaged, the  star opened up  about the possibility of tying the knot with the sports star — admitting she would say yes if he popped the question and is excited about the prospect of starting her own brood.

“I would love to have a family. We’ve talked about it. He , and I know for a fact that he would be an impeccable father,” she revealed.

“I definitely want to be a mom. But I don’t put the pressure on it. It’s not like, ‘The clock is ticking.’ I feel in my soul it will happen.”