Will Jennifer Aniston and John Mayer be bale to survive the scrutiny of the cameras? And what bout all of the travel? When John's tour took him from Michigan to Toronto for a July 7 concert, Jennifer gave up her plane seat to join him on his tour bus - a seven-hour ride that didn't get them to their hotel until 5 a.m., a report from In touch notes.

John Mayer Taking a Toll on Jennifer Aniston?

Lately, 39-year-old Jen has been working hard to keep up with the nine years younger rock star: in 11 days in July she logged nearly 11,400 miles to seven cities in four countries, the report states.


A friend tells In Touch the late nights and lack of sleep is taking a toll on her fit, youthful look. "Jennifer's lost a few pounds since she started dating John," says the friend. "It's been exhausting and exhilarating at the same time. They're always on the go and that's why she's losing weight."

"Stress, travel and exhaustion can have a dramatic effect on people's faces even after a few weeks," cosmetic surgeon Dr, Richard Fleming tells In Touch. They note that Dr. Fleming hasn't treated the star. "She looks exhausted and drawn. It gives her a hungover look, even if she hasn't been drinking. Unfortunately, it has a greater effect because she's 39 and not 25." This weekend photos of John Mayer surfaced of him in a hot tub with another woman that was not Jennifer Aniston. (See here). Us Weekly identified the gal as " the wife of a band member."