Kylie Jenner marked elder sister Kendall Jenner's 31st birthday with an emotional Instagram tribute on 4 November 2026, calling her a 'forever sister' and crediting her with shaping who she has become. The post, which included a carousel of childhood photographs of the two siblings, encapsulates a bond that has played out publicly for nearly two decades.

The Birthday Message

In her caption, Kylie wrote: 'I am who I am because of who you've been to me. Happy birthday to my forever sister ostrich/deer cutie pie.' The warmth of the note, paired with throwback images, quickly drew attention from fans who have watched the sisters grow up together on reality television and social media.

Kendall Jenner: From Reality TV to Runway Royalty

Kendall Jenner first came to global attention through Keeping Up with the Kardashians, the family reality franchise she starred in for 20 seasons and nearly 15 years from 2007 to 2021. The show's success spawned several spin-offs, including Kourtney and Khloé Take Miami, Kourtney and Kim Take New York, Khloé and Lamar, Rob and Chyna, and Life of Kylie. She pivoted decisively to modelling at the age of 14, and by 2014 and 2015 had walked the runways for high-fashion houses during New York, Milan, and Paris fashion weeks, cementing her status as a bona fide supermodel.

Kylie Jenner: Influencer, Entrepreneur, Pop-Culture Force

Kylie, meanwhile, has built a parallel empire. Currently the fifth-most-followed person on Instagram, she has translated social media clout into business success. In 2012, at age 14, she co-created the Kendall and Kylie clothing line alongside her sister. By 2015, she had launched Kylie Lip Kits, her own cosmetics line, which later evolved into the broader Kylie Cosmetics brand. In 2017, she became the youngest person to appear on the Forbes Celebrity 100 list, and also starred in her own spin-off, Life of Kylie. Time magazine listed both Jenner sisters among the most influential teenagers in the world in 2014 and 2015, specifically citing their outsized reach on social media.

Kylie's Personal Life

On the personal front, Kylie was first publicly seen with rapper Travis Scott at Coachella in April 2017. The couple welcomed their daughter Stormi in 2018. They parted ways in September 2019 but rekindled their relationship during the COVID-19 pandemic. In 2021, Kylie revealed she was expecting their second child, and their son Aire was born in 2022. It was reported in January 2023 that the couple had split again, and by April 2023 Kylie had begun dating French-American actor Timothée Chalamet.

As Kendall turns 31, the affection Kylie has expressed reflects a sisterhood that has evolved from childhood reality TV appearances into one of the most closely watched celebrity relationships in the world.