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The 29-year-old debuted her bump on Instagram in a series of snaps from a pregnancy photoshoot, where she wore emerald green flowing robes and a matching bandeau crop top.
She captioned the post: "We've dreamed about this moment for so long and we can't believe the dream is finally coming true... we can't wait to meet you."
In one snap, the Watford striker, 29, holds Leigh-Anne as she giggles and cradles her baby bump.
Naturally, friends and fans flocked to the post to congratulate the pair on their impending new arrival.
"Wow, congrats baby girl!" one fan posted. "So happy for you."
"What!" exclaimed another, posting a series of crying and love heart emojis.
"I can't believe my eyes, you're going to be a beautiful mama!" said a third.
The news comes just days after girl band Little Mix released the official video for Confetti, which saw Leigh-Anne and her bandmates, Perrie Edwards and Jade Thirlwall team up with the stars of RuPaul's Drag Race UK in a sexy dance routine.
Leigh-Anne is also set to front her own documentary on racism for the BBC. Titled Leigh-Anne: Race, Pop and Power, the one-off special will explore racism Leigh-Anne has faced throughout her career.
"The majority of the film is me talking about my experiences, being the darkest member of my band in my very white pop world," she told The Guardian. "I really wanted people to see that just because I'm successful doesn't mean I'm not going to be affected by racism.
"My reality is feeling anxious before fan events or signings because I always feel like I'm the least favoured. My reality is constantly feeling like I have to work 10 times harder and longer to mark my place in the group because my talent alone isn't enough."
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