Serena Williams’ daughter had the most adorable Halloween costume

She may be just seven weeks old, but Alexis Olympia is already a superhero.

The daughter of tennis champ Serena Williams and Reddit co-founder Alexis Ohanian dressed up as one of DC Comics' finest for Halloween this year. The little girl wore a top with the Batman logo, a purple Batmobile, and a black and yellow headband to top it off. The doting parents shared the snap of the slightly concerned-looking youngster on social media on Tuesday. They captioned the pic:

"When you realize you’re the hero Gotham needs."

https://www.instagram.com/p/Ba7eqYdnEZt/?hl=en&taken-by=olympiaohanian The couple welcomed little Alexis Olympia into the world on September 1.

The former Wimbledon Women's champion introduced Alexis to fans just weeks later with an adorable video of her pregnancy journey.

The 35 year old’s adorable time lapse included the moment they brought home little Alexis from the hospital.

She said:

“So we’re leaving the hospital after six, seven days.

“It’s been a long time, but we had a lot of complications, but look who we got — we got a baby girl!”

The montage also included a number of memorable moments from her pregnancy, like their first ultrasound, bump selfies, as well as the then-soon-to-be-parents assembling the nursery. There's even a short video of Serena holding her Grand Slam trophy at the Australian Open alongside the caption: "No one knows I'm 8 weeks pregnant."

At the end of the video, the new mum wrote:

"Hello, world. Baby girl Alexis Olympia Ohanian Jr.

"Born: September 1, 2017. Weight: 6lb 14oz. Grand slam titles: 1."