The 65-year-old momager shared a black and white photo of herself from 2012 - her first ever post on the social media site.

She captioned the snap taken nine years ago: "Hello instagram world!"

[EMBED_INSTA]https://www.instagram.com/p/CORCpg6Jtyg/[/EMBED_INSTA]

The KarJenners have monetized Instagram as a source of revenue and self-promotion. The matriarch even cited social media as a reason why her family quit their hit reality show Keeping Up With The Kardashians.

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"I have 40 MILLION reasons to be excited and thankful!!! 40 MILLION followers WOW!!! I can't believe it's been 9 years since I posted my first Instagram, and here we are, 40 million followers and 5900 posts later!!" the reality star captioned her image.

"Thank you from the bottom of my heart for your loyalty, support, positivity, brutal honestly, humor and love, for all of these years. Over 14 years of making our show, the biggest blessing has been creating relationships with our followers and our fans, and I am so grateful that we have this amazing place to communicate, connect, and share our lives."

Related: Kim Kardashian And Van Jones Dubbed 'Beavis And Big Butt' After Romance Rumors

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"I feel so completely blessed and honored that you have been there for me through thick and thin... and my, you have seen it ALL! hah!"

"You have also supported all the hopes and dreams that not only I have had, but that my kids have had as well. Thank you for following me... I'm honestly humbled and grateful. I love you guys!!!!" she said, adding:

"(This is my first ever Instagram post nine years ago!!"

But some fans threw shade on the mom-of-six - accusing her of buying her millions of followers.

Related: Caitlyn Jenner Accused Of Still Acting Like A 'White Privileged Man' After Tweet

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"Sold her soul and her daughter's sex tape," a shady comment read.

"40 million my a**. Courtesy of a bot farm. Anyone can get the followers, if they pay enough," a second added.

"I can't believe a woman this old is celebrating something so ridiculous like it's a Pulitzer," a third chimed in.

Meanwhile Jenner was recently accused of leaking a story about her daughter Kim Kardashian's love life.

A source told Page Six that the reality star is being pursued by royals, billionaires and A-lister suitors. The KUWTK star, 40, filed for divorce from rapper Kanye West, 43, on February 19. The couple were married for six-years and will share joint custody of their four kids.

Next: Kanye West Fans Beg Him Not To Reunite With Kim As He's Seen With Wedding Ring