Serena Williams took to Instagram on Monday evening to share a flattering flashback photo.

The 42-year-old tennis star looked incredibly toned and slender in a little black bikini that consisted of a low-cut top and small briefs with straps over the hips.

The tennis diva had a diamond piecing in her belly button, which was a very Y2K trend that was started by Britney Spears.

Her her hair was worn up with curly tendrils falling down around her face, and her makeup was light with pale pink lipstick.

‘Share a pic from a VERRYYY different time in your life,’ it was written over the snapshot.

The cover girl appeared to be in her 20s at the time that the photo was taken. She flashed a wide smile that made it seem as if she had not a worry in the world.

Lean: Serena Williams took to Instagram on Monday evening to share a flattering flashback photo. The 42-year-old tennis star looked incredibly toned and slender in a strappy little bikini that consisted of a low-cut top and small briefs with straps over the hips

So Y2K! The tennis diva had a diamond piecing in her belly button – the trend was started by Britney Spears

This comes after the athlete welcomed her second daughter with husband Alexis Ohanian in August.

She shared a sweet clip of herself, husband and daughter Olympia, five, with the newborn baby named Adira River Ohanian.

The caption read: ‘Welcome my beautiful angel.’

In the video Serena is seen looking pretty in a pink dress in honor of her new daughter as she walks over to Alexis and kisses him.

Olympia, also in pink, walks over to join her parents, who kiss her, before Serena indicates she has forgotten something.

The star then walks back into frame cradling the couple’s newborn daughter as the family celebrate their second child.

Revealing the baby’s adorable name on Instagram, Alexis wrote: ‘Welcome, Adira River Ohanian.

‘I’m grateful to report our house is teaming with love: a happy & healthy newborn girl and happy & healthy mama.

Meet Adira River Ohanian! Williams welcomed her second daughter with husband Alexis Ohanian in August

‘Feeling grateful. @serenawilliams you’ve now given me another incomparable gift — you’re the GMOAT. Thanks to all the amazing medical staff who took care of my wife & our daughter. I’ll never forget the moment I introduced @olympiaohanian to her baby sister.

‘Your peace would have been like a river, your well-being like the waves of the sea.’

In early August  Serena revealed the gender of her daughter alongside her husband at a party.

The tennis player and her spouse first met when they ran into each other at a hotel in Rome in May of 2015, and they began dating not long afterward.

The pair went on to become engaged in December of 2016, and they welcomed daughter Olympia the following September.

Ads: Here she was seen in a plug for Serena Williams x Nike. ‘The Fall @serenawilliams Design Crew Collection has arrived. Powered by the future of design, putting their stamp on the here and now,’ the caption read

The two subsequently tied the knot during a star-studded wedding ceremony that took place in New Orleans that November.

Williams announced that she had become pregnant for the second time just before the Met Gala this past May.

The former athlete spoke about motherhood during an interview with Vogue, where she expressed that she did not see herself as a parent during her younger years.

‘Earlier in my career, I never thought about having kids. There were times when I’ve wondered if I should ever bring kids into this world, with all its problems. I was never that confident or comfortable around babies or children,’ she said.

Williams then expressed that she had since learned to embrace parenthood and remarked that she had become particularly attached to her daughter.

‘The fact is that nothing is a sacrifice for me when it comes to Olympia. It all just makes sense,’ she said.