The Keeping Up With The Kardashians star uploaded a picture to Instagram on Sunday (11 May) showing herself lifting little North into the air.
(In the US, Mother's Day falls on a different day to the UK.)
She told fans: "This little girl has changed my world in more ways than I ever could have imagined! Being a mum is the most rewarding feeling in the world! Happy Mother's Day to all of the mums out there!"
Kim, 33, gave birth to North in June 2013. North is her first child with rapper fiancé Kanye West.
Judging from Kim's white dress, the picture appears to be have been taken over the weekend while Kim was celebrating her bridal shower with her nearest and dearest.
The starlet threw a lavish white-themed bash in Los Angeles to mark her upcoming wedding to Kanye, expected to take place in Paris before the end of the month.
Kanye proposed to Kim on her 33rd birthday in October 2013, popping the question in front of her friends and family at a baseball stadium he'd hired just for the occasion. He even threw in fireworks and an orchestra to make the whole event extra special.
He also made yesterday extra special for his fiancée, gifting her with a wall of flowers to mark her first Mother's Day. Yes, a wall of flowers!
Kim posted a picture of her wall to Instagram, saying: "I woke up to a wall of roses, hydrangeas and peonies! I have the best fiancé in the world! I love you so much baby!"
A nice and unusual gesture, yes, but we're inclined to agree with plenty of Kim's fans who questioned: what exactly does one do with a wall of flowers?!
Well, keep their child entertained might be one answer, as Kim later tweeted a photo of little North looking rather fascinated by the wall.
As well as cuddling up to baby North, Kim also sent thanks to all the other mothers out there, including her own mum Kris Jenner, her grandmother MJ and her sister Kourtney, who is a mum of two.
"Today is a special day to honour all the incredible mothers in our lives!" she told fans. "To my mum, you've taught me so much and have inspired me in so many ways. I am truly proud to be your daughter and thank you for all your love and support through the years.
"Kourtney, you're not just my older sister, but one amazing mother to Penelope and Mason. I've learned so much from you and feel so blessed to have you in my life. And I can't forget grandma MJ, what would I do without you… You have always been an inspiration to me as well as our entire family. I love you all so much!!"
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Copyright: WENN Twitter @realbkbrown / Instagram @norman cook / E! Instagram @kimkardashian / Rex Features