Jennifer Aniston poses in nothing but a necktie on the the cover of GQ and is lookin HOT!  The 39-year-old actress opens up about her on-off again relationship with boy-toy John Mayer, Brangelina and turning 40!  

Brad eat your heart out!  

The January issue hits newsstands on December 23 just in time for her to promote her new movie, Marley & Me, which opens in theater on Christmas Day! 

Filed under: Celebrity, Magazines, Movie