Kourtney Kardashian has reportedly clapped back at a fan who claimed Kim Kardashian shared a shady bikini picture to mark her older sister's birthday.
Though the POOSH founder and the SKIMS mogul have previously butted heads on their successful reality TV show, Kourtney has no bad blood with her younger sister.
On Thursday (April 18), the mom-of-four celebrated her milestone 45th birthday and was sent touching messages from her 224 million followers.
One of those heartwarming messages was from Kim, who took to Instagram to give her birthday blessings to her older sister.

The reality TV star shared a bikini shot of her with Kourtney and Khloé Kardashian, and wrote in the caption: "Happy Birthday Queen @kourtneykardash There’s no one on this planet that I have spent more time with and have all of the same memories with growing up than you and I cherish them all.
"Sharing a room and friends and cars and our lives together for four decades has been the most magical journey to have you by my side. I love you and I can’t wait for another 45 years together!" she continued.
"I will especially cherish this last sister trip where all of our kids had dance parties til they passed out, the way we all did growing up! Celebrating you today and grateful to you forever for always giving the best advice a sister could possibly give!" she concluded.
Check out Kim's birthday message to Kourtney below:
Assuming the birthday girl wouldn't like the snap of her body figure on display, a follower wrote: "Now you know she’s not going to like this photo… lol it’s her bday Kim.. lol," according to TMZ.
However, Kourtney proved them wrong as she responded: "I LOVE this photo! It is me and my sisters having the best time on a trip with our kids…and the memories to last forever! And I LOVE this body that gave me my 3 big babies and my little baby boy."

Kourtney shares sons Mason, 14, Reign, nine, and daughter Penelope, 11, with her ex, Scott Disick, and she welcomed a baby boy with her husband, Travis Barker, in November 2023.
The business mogul criticized the pressure for women to go back to their pre-baby body shapes in a candid post on her Instagram Story.
"Your body is beautiful at all stages," she wrote, as cited by Page Six. "During pregnancy as we are glowing and growing, postpartum as we are healing and shrinking, and then that period I find hardest as our bodies are still adjusting."
She continued: "I try to be kind to myself as my body finds a new normal. The pressure put on us to bounce back when everything is new and different isn’t realistic. Life is beautiful, you are beautiful. Just a little reminder (for me too). XOXO."
In addition to getting a lovely birthday post from her younger sister, the Lemme creator was also honored in a heartwarming tribute shared by her husband, Travis Barker.
The slideshow included a photo of the birthday girl smiling from ear to ear as she cuddled with their toddler in bed, a snap of the proud parents kissing in front of an airplane, and a picture of her relaxing on a yacht with her partner.
In the final snapshot, the brunette beauty is humorously captured all dolled up for a glamorous night out, squatting atop a toilet with her black dress lifted.
"Happy Birthday to my beautiful wife, soulmate, and best friend forever," the 48-year-old rocker captioned the post. "I love you, I love our life together. Thank you for being the most amazing wife a person could ask for. Here’s to many more years of adventures together."
Kourtney responded to the sweet post by calling Barker the "husband of [her] dreams".