With all the buzz about Jennifer Aniston's involvement with John Mayer, it's not surprising a number of the actress' closest friends -- including the ones from "Friends" -- are concerned.
"It's not that we don't like John, it's just that he does have that reputation as something of a serial dater who never sticks with one woman very long,'' said a close buddy of Aniston.
News of a romance between John Mayer and Jennifer Aniston broke last month when the Miami Herald spotted the duo acting "all cozy" during lunch at a restaurant there. Aniston was in Florida filming "Marley & Me." In Touch reported Mayer checked into the Four Seasons hotel but spent hardly any time there, hanging out instead at Aniston's suite at the Mandarin Oriental.
No question about it, the singer has been linked to a long list of stars, including the Pussycats Dolls' Nicole Scherzinger, Jessica Simpson and Cameron Diaz -- with whom he's remained so close, he attended her dad, Emilio's, recent funeral.
Aniston herself reportedly is worried -- mainly because she really likes Mayer. "It wouldn't be a big deal if this was just a casual thing,'' said the friend. "But Jen isn't into 'casual'. ... She wants a real, solid, genuine relationship.''
STILL OBSESSED: Then there's this new development: Just when we thought Aniston had let go of the Angelina Jolie-Brad Pitt thing, recent press coverage of Brangelina being in the South of France "has made Jen brood about all that all over again,'' another Aniston source told me Tuesday.



