Michael Schumacher continues his battle for life at the Grenoble hospital in France As Michael Schumacher, the most successful F1 racer in the history of the sport, spends his 45th birthday in a medically-induced coma after a skiing accident in the French Alps, celebrities and fans send their best wishes in hope that he would recover soon! Happy Birthday to Michael Schumacher ! One of the fittest 45 year olds that I know. If anyone can fight through his injury, it's him ! ? Karun Chandhok (@karunchandhok) January 3, 2014 Best wishes to Michael Schumacher and his family on his birthday today. #StayStrongSchumi ? Jenson Button (@JensonButton) January 3, 2014 A sand artist has made his own amazing tribute to Schumacher on his 45th birthday in hospital today? Get well soon pic.twitter.com/laMKPt3Cu1 ? Mark Robinson (@robboma3) January 3, 2014 Fans have gathered outside Grenoble Hospital to commemorate Michael Schumacher's 45th Birthday (via @bbcworld): pic.twitter.com/bhTKBRkkRx ? Peter Leung (@BaronVonClutch) January 3, 2014 We send you all our support!! Te mandamos toda nuestra fuerza!! pic.twitter.com/1AtDmHVYCl ? Mikel Arteta (@m8arteta) January 1, 2014 Ferrari fans plan red vigil for Michael Schumacher on his 45th birthday http://t.co/9yse7o2D2v pic.twitter.com/BD77MsN6vO ? Reuters India (@ReutersIndia) January 3, 2014