Kylie Jenner has sparked rumours of another feud between her and Kendall after she was the only family member not to wish her sister a happy birthday.
The model, who turned 27 on Thursday, was inundated with messages from fans and family members.
Kourtney, 42, shared a sweet photo of her playing with a very young Kendall's pigtails in a throwback snap from 1999.
Dressed in a black vest top and grey combat trousers, she smiled at the camera, while Kendall already looked to be practising her model pout.
Older sister Khloe, 38, also shared a series of photos of the pair taken over the years.
One of the adorable photos was a very young Khloe cuddling her baby sister at what looks like a wedding.
"To my very first baby, happy birthday @kendalljenner you are the one who stole my heart and you made me fall in love in more ways than I even knew possible," she wrote in a heartfelt caption.
"You are the one who taught me responsibility, patience, unconditional love and compassion.
"Wishing you the happiest of birthdays my gorgeous pure Kenny. I pray every year gets better and better and you are happier and happier with every passing day. I pray you are forever spoiled with love and health," she added.
Kim jumped on the bandwagon and also shared a throwback photo of her planting a kiss on Kendall's cheek.
Kendall, who was just a baby at the time held onto her sister's hand as she snuggled in bed.
She added the caption: "Always the voice of reason and the one who will check me when no one else will say it LOL I’m always so proud of you for following your truth and my God you are so pretty inside and out."
Kendall's mum Kris Jenner, 66, also shared a video of her daughters in a sweet reel.
However, Kendall's younger sister Kylie, 25, didn't take to social media to celebrate her birthday.
In an online thread, fans were quick to notice this and claimed that this was proof that the two were feuding.
One wrote: "Maybe they beefing again. Are they filming for the show right now?"
Another fan echoed: "Why hasn’t Kylie posted a birthday post for Kenny? Because she didn’t want to."
"They literally have each other’s number. Kylie could have simply just texted Kendall and be done with her," a third added.
A fourth person argued: "Why does Kylie have to if they're beefing?
Kendall recently called out claims that she's a "mean girl", adding that the comments can be "upsetting".
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She was previously called a "rude person" by Kris' boyfriend Corey Gamble.
And in an episode of Keeping Up With The Kardashians, she and Kylie ended up in a row over an outfit.
The girls were heard screaming and hitting each other, with Kendall shouting: "You put your heel into my f***** neck!", to which Kylie replied: "That's because you f****** slapped me!"
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