The tennis star took to IG to share a new photo of her growing bump, penning  a sweet message to her unborn child as well.
She wrote:

'My Dearest Baby, You gave me the strength I didn't know I had. You taught me the true meaning of serenity and peace ,

'I can't wait to meet you. I can't wait for you to join the players box next year,' she continues.
'But most importantly, I am so happy to share being number one in the world with you... once again today. From the world's oldest number one to the world's youngest number one. - Your Mommy.'

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