On 11 September (05) - two days after Zellweger filed marriage annulment papers - the singer checked into Desert Hot Springs, California's We Care Spa, which enforces a strict no-food, all-liquid diet of daily vegetable juices and cleansing teas.
And on the evening of 15 September (05) - his final day at the spa - Chesney left the premises with new friend TARA GREEN and her sister.
According to the singer's representative, they were part of a large group that went out that night.
The Greens stayed in a villa next to Chesney's, and on the final night they all went to see hit comedy THE WEDDING CRASHERS at a local cinema.
At the end of the night, Chesney decided to leave the spa a day early.
Tara Green tells America's Star magazine, "He had a limo pick him up and take him to the airport; he didn't say where he was headed."