Jennifer Aniston mayerbday.jpgX17 has the FULL story of John Mayer's wild birthday bash last night, so here it is ...

Aniston stopped by pal Courteney Cox's house for a party celebrating David Arquette's new clothing line Propr ...

Then Jen made her way to the Grand Havana Room cigar bar in Beverly Hills, where she met up with John, who came over from the Beverly Hills Hotel.

They both arrived around 10:30 pm and stayed until 1:30 am this morning!

But the night wasn't over yet! ... The couple went back to Aniston's Hollywood Hills home where she hosted a total blowout for her pap-loving b-friend. Guests were still arriving at 4:30 am!!!!