Serena Williams has blown everyone away with these post baby pictures!

New mum Serena Williams has taken to Snapchat to show off her impressive post-baby body.

Just a fortnight after giving birth to daughter Alexis Olympia Ohanian Jr, the tennis star has managed to get back into her pre-baby denim cut-offs.

"Back in my jean shorts 2 weeks ..." she captioned the selfie.

She announced the name of her baby girl on Instagram. Her newborn baby carries the same name as her father, Reddit co-founder Alexis Ohanian.

She also told of how the family had to spend six days in the hospital after her arrival because of complications.

'Look what we got! A baby girl' she said the end of the video, showing Alexis Jr.
She does not elaborate on the complications but indicated there was an extended hospital stay.

"So we're leaving the hospital after six, seven days," the tennis champion said in the clip. "It's been a long time, but we had a lot of complications, but look who we got - we got a baby girl."

The video was also posted to YouTube by Ohanian.

Williams, 35, and fiance Ohanian, 34, welcomed their first child on September 1 in West Palm Beach, Florida, where their baby girl weighed in at 3.1kg.

She also posted a photo of her daughter resting on her shoulder to Instagram.

The caption said: "Meet Alexis Olympia Ohanian Jr. You have to check out link in bio for her amazing journey. Also check out my IG stories."

The video also shows how Williams knew two weeks before playing the Australian Open that she was pregnant.

She even cheekily kisses her Australian Open trophy and calls it "my baby", while her Snapchat caption states, "No one knows I am 8 weeks pregnant."

This article was first published on nzherald.co.nz and is republished here with permission.