Olympic hero Michael Phelps dived into New York to celebrate New Year’s Eve. The multiple gold medal-winning swimmer spent the night at hot Chelsea lounge Avenue with a group of six guy friends and six girls. A witness tells us, “Phelps stayed until around 3:30 a.m. Dressed in jeans, white shirt and a blue blazer, he looked super-fit and healthy, sending rather a few women in the room into a swoon. He spent the night celebrating with his friends and doing shots of Don Julio tequila.” Phelps, focusing on training for the 2012 Olympics, tweeted, “2012 is here!!! Finally!!!! Brought in with good and the best ppl in the world!!!!”