In view of her 34,200 followers, Kelly captioned the photo: “Happy birthday little sis!
“We might not be these kids anymore, but the dream is still the same.”
She added: “Here’s to love, adventure and cake! Have the best day @hollywilloughby Love you to bits.”
Holly took the opportunity to react to the post, as she commented: “Love, adventure and cake… what a trio… love you Kelly.”
