Serena Williams is thrilled about motherhood and wrote a sweet message to her unborn child. She writes, 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. But most importantly, I am so happy to share being number one in the world with you…. once again today. On @alexisohanian bday. ? from the world’s oldest number one to the world’s youngest number one. -Your Mommy.