Globe; WireImage

Thursday May 08, 2008 01:45 PM EDT

He's....back!

John Mayer arrived at the Mandarin Oriental hotel in Miami Beach at 12:30 p.m. today, Life & Style can reveal exclusively. It's the same hotel where the new woman in his life, Jen Aniston, is staying!

"John came in with another man who looked like a personal trainer. John was in long gray shorts and a green T-shirt, and was holding a water bottle. He looked like he just finished a workout," an eyewitness tells Life & Style. "His hair was still in its new signature cut and he was in a great mood."

Life & Style earlier reported that John was overheard saying in New York City last week that he couldn't wait to get back down to Miami.

Stay tuned for more on these two!