Stars react to Serena Williams' retirement: Kim Kardashian and Gabrielle Union lead tributes

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Serena Williams shocked the world as she announced that she is eventually stepping away from tennis without using the word 'retirement' in a Vogue cover story.And Kim Kardashian and Gabrielle Union led the stars reacting to the groundbreaking news.The 41-year-old SKIMS founder and 49-year-old actress took to Instagram to lead celebrity tributes to the 40-year-old 23-time Grand Slam singles champion.Scroll down for video  Big news: Serena Williams shocked the world as she announced that she is eventually stepping away from tennis without using the word 'retirement' in a Vogue cover story, as she is joined by daughter Olympia (right)  Dynamic duo: Kim Kardashian (left) and Gabrielle Union led the stars reacting to the groundbreaking newsBoth stars made similar statements as they shared goat imagery which is a reference to the highly-popular phrase of the 'greatest of all time.'Kim commented on Serena's post on the picture and video sharing social network with goat and flowers emojis.

Gabrielle shared Serena's post on her Instagram story with a photo of a goat's face and adding: 'Can't wait to see what's next friend.'The Serena news sent shockwaves through the sporting world on Monday.'I'm here to tell you that I'm evolving away from tennis, toward other things that are important to me,' the legendary athlete has announced in the latest issue of Vogue.

Sweet: Kim commented on Serena's post on the picture and video sharing social network with goat and flowers emojis 'It's the hardest thing that I could ever imagine.