ALEX Rodriguez and Hideki Matsui celebrated the Yankees clinching a trip to the World Series with a meal at Serafina — but not together. The two had separate tables at the restaurant on East 61st yesterday. A-Rod was joined by girlfriend Kate Hudson and others, while Matsui dined nearby with his own group. A spy reports, “They all arrived at the same time but took separate tables. Everybody seemed to be in excellent spirits.”