Sources say Jennifer Aniston and John Mayer are crazy about each other despite only dating a brief time. The pair began dating late last month. The were spotted having dinner and holding hands in Miami, where Aniston is filming ‘Marley and Me’ with Owen Wilson.

An insider says Mayer and Aniston’s romance is already “hot and heavy.”

 

“It’s hot and heavy but in that very cool way. John isn’t going to hide his adoration and he’s telling everyone what a cool chick Jen is,” the source says.

 

Mayer, 30, even has a big surprise to plan for the actress. Reports say the singer plans to sing to Aniston, 39, at a wrap party of Marley and Me. “Everything was changed at the last minute so John could do this for her,” says a source. “He’s crazy about Jen.”