'She has the biggest heart': Serena Williams' fiance Alexis Ohanian gushes over the pregnant star and says she will give '100% of herself as a mother'

She is expecting a baby with her fiance in September.

And Serena William's beau Alexis Ohanian, gushed over the size of the sport star's heart, on Monday evening.

The 33-year-old Reddit co-founder described the tennis ace as having the 'biggest heart', as they attended the Met Gala together. 

Expecting parents: Serena William's beau Alexis Ohanian gushed over the size of the sport star's heart, on Monday evening

Expecting parents: Serena William's beau Alexis Ohanian gushed over the size of the sport star's heart, on Monday evening

'She has the biggest heart. Everyone sees her success as an athlete, but all of that is layered on the size of her heart. 

'She gives 100% of herself to everything she does: as a friend, as a lover, and soon, as a mother,' he told Humans of New York photographer Brandon Stanton. 

The couple are seen together, with Serena glowing and sporting a blossoming bump. 

Ace-ing pregnancy: Vogue shared a video of the world number one

Ace-ing pregnancy: Vogue shared a video of the world number one

She wasn't letting her pregnancy slow her down, however, as she showcased her dance moves on Vogue's Instagram account. 

They shared a video of the world number one, as she used her emerald gown to create shapes against a changing background. 

The athlete rocked a sleek and straight short hair style, as she turned heads in her beaded green garb.

Stunning: The athlete rocked a sleek and straight short hair style, as she turned heads in her beaded green garb

Stunning: The athlete rocked a sleek and straight short hair style, as she turned heads in her beaded green garb

Glowing: They captioned: '@serenawilliams turned up for her first major outing since announcing her pregnancy at the #MetGala in a curve-hugging custom #atelierversace dress'

Glowing: They captioned: '@serenawilliams turned up for her first major outing since announcing her pregnancy at the #MetGala in a curve-hugging custom #atelierversace dress'

Got moves: She used her emerald gown to create shapes against a changing background

Got moves: She used her emerald gown to create shapes against a changing background

Baby on board: Her bump was clearly visibly as she was a picture of radiance in the video

Baby on board: Her bump was clearly visibly as she was a picture of radiance in the video

On top of the world! The tennis star looked to be having the time of her life

On top of the world! The tennis star looked to be having the time of her life

Check mates: The lights reflected on the white background to create different looks for the video scene

Check mates: The lights reflected on the white background to create different looks for the video scene

They captioned: '@serenawilliams turned up for her first major outing since announcing her pregnancy at the #MetGala in a curve-hugging custom #atelierversace dress.' 

The tennis champ told Vogue she did not yet know the gender of their child.

'We're waiting. [It's] a surprise. We call it "baby,"' she said. 

The Met Gala is her very first red carpet appearance since accidentally announcing her pregnancy nearly two weeks ago. 

The star recently confessed the Snapchat which revealed she was 20 weeks along was sent by mistake.   

'I was on vacation, taking time for myself, and I have this thing where I've been checking my status and taking pictures every week to see how far along I'm going,' she said at Ted Talks in Vancouver last month.

She added: 'I've been just saving it, and you know how social media is – you press the wrong button and… My phone doesn't ring that much, and 30 minutes later, I'd missed four calls, and I'm like, "That's weird." And then I picked it up and I was like, "Oh no".' 

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