Charles Leclerc's wife Alexandra showed off her 'baby bump' as she joined him and their miniature dachshund Leo on board a £15million yacht in Sardinia on Wednesday. The brunette beauty, 25, wore a £477 citrus minidress from Revolve and added stylish shades and gold earrings to her look. The Formula One ace, 28, owns a custom Riva 102' Corsaro Super superyacht named Sedici which is thought to be worth around £15million. The couple, who haven't announced they are expecting their first child together, were seen chilling on board, before Charles went on a jet skiing session. They had brought their beloved dachshund Leo along for their…