Longtime couple Nicole Richie and Joel Madden will finally tie the knot the first weekend of December, sources reveal exclusively to X17online.

Saturday night, a witness at the Soho house overheard Nicole dishing about her upcoming nuptials to BFF Christina Aguilera.

The source tells X17online exclusively:

    "I heard Nicole Richie talking excitedly to Christina Aguilera about her upcoming wedding. She said, '29 days to go!'"

Another source confirms the early December date, but says the wedding won't be the only party the couple will be throwing. This source says Nicole and Joel are also staging a "decoy event" to try to throw reporters off the scent of the real wedding!

Seems like a lot of trouble to go to in order to keep things private. Although we're sure the media-savvy couple has already sold the exclusive wedding photos in advance to a publications, so perhaps it's not too much trouble to try to protect their payoff, especially since they stand to make even more than their wedding budget!

Nicole and Joel have been together for over four years and have two children together, Harlow, 2, and Sparrow, 1.

The couple confirmed their engagement last February, and in September, Nicole hosted a bachelorette party in Cabo San Lucas, Mexico, which was attended by celebrity BFFs including Christina Aguilera and Samantha Ronson. But we're sure the guest list for the wedding of the Simple Life star and the Good Charlotte frontman will be even more star-studded than her bachelorette party!