Holly Willoughby has wished her older sister a happy birthday by sharing a number of throwback snaps on Instagram.
The This Morning presenter, 37, posted a collage of images of her and Kelly over the years as Kelly turns 40.
In one of the snaps, the siblings look angelic in their school uniforms, while on another they enjoy a family day out to the Tower Of London, posing with a Beefeater who dwarfs them as little girls.
She also added more recent images of the pair, who have teamed up to write children's books together.
Wow!! You both look so alike
Holly said beside the images: "Nothing but pure love for this one today and always... my sister... love you... beyond! @ladywilloughby happy 40th birthday."
Many of her followers commented on the post to wish Kelly a happy birthday and say how much they liked the selection of pictures.
"Haven't changed a bit Holly," one said of the childhood pictures.
"Wow!! You both look so alike," said another.
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Others commented on how good Kelly looked as she reaches the milestone age.
"40!!! I wish I could look like that now," one said. Another agreed, writing: "She looks amazing for 40."
Among the well-wishers was one of Holly's famous friends, Spice Girl Emma Bunton.
She wrote: "Happy birthday gorgeous lady."
Holly has previously spoken of how close she and Kelly have always been.
"We're more like friends than sisters. We even bought a place together in Putney. You would expect some fireworks, but because we have the same friends and have different roles within that group, none of that ever came into it," she told The Guardian.
She added that Kelly is great at keeping her organised.
Her big sister agreed, and said they continue to enjoy spending time together now they both have families of their own.
Holly is a mum to Harry, Belle and Chester with husband Dan Baldwin, while married Kelly has daughter Darcey, who featured on the cover of Holly's book Truly Happy Baby.
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Kelly said: "Now we're both mums, but I see her every day. I live just down the road. She'll phone me on a Saturday and say: 'Right I’m in the car coming over for a cuppa. Are the kids up?'"
Ahh, sisterly love!
Are you close to your sister like Holly and Kelly? Leave us a comment on our Facebook page @EntertainmentDailyFix and let us know what you think!