Serena shows off her little smasher...

SHE’S one of the greatest female athletes of all time, with 23 Grand Slam singles titles and seven Wimbledon wins under her belt, but yesterday Serena Williams was celebrating a very different kind of victory.

Delighted to hit ten million followers on the social media site Instagram, the 37-year-old marked the occasion by sharing online an intimate family snap of her and her one-year-old daughter, Olympia, playing in a sandbox.

Looking relaxed with her hair down, Serena watches over Olympia, whose father is Reddit co-founder Alexis Ohanian, as she sports a £10 black romper reading ‘More Issues Than Vogue’.

With two red hearts, Serena captions it: ‘For my ten million followers. Thank you.’