Behind the scenes: Jennifer Aniston's 40th birthday bash

Is Jennifer Aniston throwing herself an early star-studded 40th birthday bash?

So did our invites get lost in the mail? Did yours?

And will John Mayer give Jennifer Aniston an engagement ring at the party and then whisk her way for a secret romantic birthday getaway? That's the rumor.

Check out Radaronline, which has a video crew camped out, filming tents being erected at her Beverly Hills home in preparation for the star-studded blowout.

Pretty exciting, huh?

Her actual b-day is Feb 11. But will the party be held earlier?

A-listers on the list include her proverbial boy-toy Mayer, BFF Courteney Cox and her husband David Arquette, and Sheryl Crow.

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John and Jen: Back on!

Photo: Jennifer and John at the "Marley and Me" wrap party in Miami. Credit: WireImage

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