Paris Hilton shared a series of throwback photos twinning with her sister Nicky on Monday, Oct. 7, to celebrate her sibling's ...

Paris Hilton celebrated her sister Nicky Hilton's big day.Paris shared a carousel of childhood photographs on her sister's ...

You grab a gift and an endearing birthday greeting card, but you may open the card and wonder “What happy birthday wish ...

Happy Sweet 16 to my angel girls. You are the most special girls in the whole wide world. I am so lucky to be your big sissy ❤️,' wrote the beauty.

Riley Keough is showing her siblings some love on their birthday! In honor of the Daisy Jones & the Six star's twin sisters ...

Lisa Marie Presley's twin daughters Harper and Finley marked their milestone 16th birthday, and their older sister Riley ...

Kareena Kapoor Khan shares an amazing bond with Saif Ali Khan ‘s sister and actor Soha Ali Khan. On Soha’s birthday, Kareena ...

Jessica Simpson marked her younger sister  Ashlee Simpson's 40th birthday by posting a heartfelt tribute to her on Instagram.

I am beyond proud to be your Mom and to witness the amazing person you are becoming,” the “RHONJ” star gushed on Instagram.

Rose gold balloons that read "HAPPY BIRTHDAY NICKY" are seen surrounded ... Paris' gesture for Nicky's birthday is one of the many ways the sisters show their love for one another.

Priyanka Chopra shows her love for to-be sister-in-law Neelam Upadhyaya on the occasion of her birthday. On Saturday, PeeCee ...

Paris Hilton is “sliving” for sister Nicky Hilton's 41st birthday ... Rose gold balloons that read "HAPPY BIRTHDAY NICKY" are seen surrounded by smaller pink and silver balloons.