John Mayer Celebrates 31st Birthday With Jennifer Aniston

John Mayer rang in his 31st birthday at exclusive Beverly Hills cigar bar Grand Havana Room October 15 - with back-on girlfriend Jennifer Aniston by his side.

The relaxed pair hung out on a private outdoor patio for several hours late in the evening. Mayer, at one point, affectionately stroked Aniston's hair.

The singer - whose actual birthday is October 16 - and the Marley and Me actress, 39, began a whirlwind romance in April, but split in August.