Serena Williams Reaches '10 Million Followers On Instagram'... Posts Daughter's Photo To Celebrate

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She's consistently setting milestones personally and professionally. And Serena Williams was a champ in the former category as she surpassed 10 million followers on her Instagram feed yesterday.

And the 37-year-old tennis superstar commemorated the event by posting an adorable photo of her daughter Alexia Olympia, one, with the caption: 'For my 10 million followers, thank you!'