Jennifer Aniston is usually a low-key kind of gal — but when she wants to, she can work it. The star wasn’t shy about showing off her hot new bikini body and her hot (younger!) new boyfriend, John Mayer, while soaking up the rays at Miami’s Mandarin Oriental hotel on May 10.

Arriving at the hotel pool around 3 p.m., the couple proceeded to raise the temperature. “From the minute they sat down, there was lots of touching and kissing,” says an onlooker. “It seemed like they wanted the entire world to know they were together.”

To read more about the Jen and John’s steamy vacation, pick up the latest issue of Life & Style, on newsstands now!