Serena Williams is showing off her post-baby body.

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Williams gave birth September 1

She's talked about criticism of her body

CNN  — 

Get it Serena Williams!

The tennis superstar has snapped back in a big way since giving birth.

Her daughter, Alexis Olympia Ohanian Jr., was born September 1 and is the first for Williams and her fiancé, Reddit co-founder Alexis Ohanian.

Related - ‘Hello, world:’ Meet Serena Williams’ baby girl

On Thursday, she shared a selfie on her official Instagram account showing her slimmed down physique in a black t-shirt and what appears to be either black short shorts or a pair of undies.

In a recent letter to her mother posted on Reddit, Williams talked about her powerful physique and wrote, “I was looking at my daughter (OMG, yes, I have a daughter) and she has my arms and legs! My exact same strong, muscular, powerful, sensational arms and body.”

“It has been said I don’t belong in Women’s sports – that I belong in Men’s – because I look stronger than many other women do. (No, I just work hard and I was born with this badass body and proud of it),” she wrote.

Williams showed off that powerful and very pregnant physique for a Vanity Fair cover story in the August issue. She appeared nude with her baby bump and marveled in disbelief about her pregnancy.
“It just doesn’t seem real … If you would have told me last year in October or November that I would have a baby, not be pregnant but have a baby, I would have thought you were the biggest liar in the world,” Williams said at the time.