Serena Williams’ daughter Olympia had the most adorable reaction to learning that she is going to be a big sister, and our hearts have now officially melted.

In a Youtube video clip (see above) shared by tennis champion Williams on Tuesday, titled 'Olympia's Surprise', the athlete began by showing viewers a close-up of her positive pregnancy test, and noted that she was 'super happy'.

The 41-year-old, who revealed earlier in May at the Met Gala that she and her husband Alexis Ohanian were expecting their second child, also documented the moment her five-year-old daughter sprung out of the sofa when she learned the news.

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Olympia, who was sat in between her parents before learning she was to be a sibling, started shrieking and running excitedly around the room when she found out the news.

Earlier in the video, Williams joked that while Olympia didn’t know she was expecting, the couple’s first born did notice her body changing.

‘Olympia does not know right now that I am pregnant, but she did call me fat, and then she got really like stressed out,’ Williams recalled. 'She was like "Mummy, you're fat,"' Williams said, mimicking her daughter’s voice.

serena williams daughter olympia reacts pregnancy news
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Williams continued: 'I tried not to take it personal, 'cause I'm like super into fitness, but I'm like, "uhh, am I?"' She added: 'I'm really, really excited to see her reaction.'

At the time of sharing her pregnancy news with Olympia, Williams asked her: 'Remember how you've been praying for a little sister or brother? Well, we went to the doctor, and it turns out I'm not getting fat. But I have a baby in my belly.'

An elated Olympia asked: 'What, are you kidding me?'

Alexis added: 'You're going to be a big sister.'

Olympia then cuddled her mum, before Williams asked her daughter if she wanted to see her baby bump, at which point she unbuttoned her jeans and lifted her T-shirt for the big reveal. It was at this point Olympia jumped off the sofa and ran around in pure joy.

We’re already used to seeing heartwarming mother-daughter photos of the pair on Instagram, so we can't wait to see the family’s new addition feature on social media soon.

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Sakaynah Hunter
Former News Editor

Sakaynah Hunter was the former Digital News Editor at ELLE.