By Matt Audilet Former superstar tennis player Maria Sharapova announced her pregnancy with an Instagram post on Tuesday, her 35th birthday. “Precious beginnings!!! Eating birthday cake for two has always been my specialty,” she wrote. Sharapova was engaged to British businessman Alexander Gilkes in December 2020. Gilkes, 42, is a well-connected millionaire with personal ties to the royal family. “I said yes from the first day we met,” Maria wrote as the caption to their engagement post. “This was our little secret, wasn’t it.” Sharapova was engaged once before to Slovenian professional basket…