Retired tennis superstar Serena Williams unveiled her latest project on the red carpet at the Met Gala in New York on Monday -- she is pregnant with her second child. "Was so excited when Anna Wintour invited the 3 of us to the Met Gala," Williams said on Instagram just before she arrived at the Metropolitan Museum of Art, decked out in a black and white gown, for fashion's biggest night of the year. In the photos, the 41-year-old tennis great is seen posing in a black and white gown with her husband Alexis Ohanian, the founder of Reddit, and cradling the baby bump.