Khloe Kardashian
Khloe Kardashian (R) is expecting her first child with boyfriend, NBA star Tristan Thompson Ronald Martinez/Getty Images

Khloé Kardashian, 33, finally announced that she is pregnant with her first child in a sweet Instagram post which shows her growing baby bump.

The intimate black-and-white image has Khloé and her boyfriend Tristan Thompson, 26, cuddling the bare baby bump.

Calling the pregnancy a dream come true, the new mum-to-be shared an emotional message along with the picture.

She wrote: "My greatest dream realized! 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."

Khloé then gushed about her beau Thompson saying: "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!"

News of her pregnancy first broke in September but Khloé hadn't confirmed the reports until now.

She thanked her fans for their patience while waiting for the official announcement to be made.

"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," the reality star wrote.

"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! ❤️❤️❤️"

The Instagram post was shared on Wednesday (20 December) and has already garnered over six million likes.

Khloé's basketball player boyfriend later wrote a heartfelt comment on the Instagram post. He said: "My love, Thank you for allowing me to be apart of your journey and entering your life that day at the bel air hotel. One of the best moments in my life.

"I'm soo happy to be on this journey together with you and creating this angel from the man above. Everyday I give thanks to him for bring us together.

"I love you soo much and I know our little angel feels the love we share together and will know that mommy and daddy loves them unconditional forever and ever amen."

Girls Aloud star Cheryl, 34, was one of the first celebrities to congratulate Khloé. The ecstatic singer wrote: "Khloeeee!!! such amazing news. I could not be happier for you. You gorgeous soul!

"You are about to have the best, most precious time of your life. And you truly deserve it. Congratulations Mommy. Wishing you a happy healthy pregnancy and what a wonderful way to start a new year."

Cheryl gave birth to baby Bear with Liam Payne, 24, in March this year.

The Kardashians are now expecting three new additions to their family. Kylie Jenner, 20 is thought to be pregnant with a baby girl and Kim Kardashian, 37 is having a baby via surrogate.

While this is Khloé's first child, Thompson is already father to one-year-old Prince with ex-girlfriend Jordan Craig.

❤️ My Love ❤️

A post shared by Khloé (@khloekardashian) on