The young woman reportedly told her girlfriend Christina Aguilera about her intention to marry at SoHo House in Los Angeles last weekend.
A source overheard the conversation between the two stars: “I heard Nicole Richie talk enthusiastically with Christina Aguilera about her upcoming marriage. She said, ’29 days to come! ‘”
“Christmas has always been about family and faith for Nicole and Joel, so there is not better time of the year for them to wed,” an insider told RadarOnline.com.
The maid of honor will be Nicole’s best friend, Masha Gordon, while the best man will be Joel’s twin brother, Benji.
Nicole’s daughter Harlow will serve as a flower girl.
Father Lionel will walk Nicole, the daughter he adopted, down the aisle, RadarOnline.com is told.
The loving couple had even scheduled a false ceremony in order to fool the paparazzi.
“Nicole and Joel will spend Christmas with their family after the wedding, before heading off on honeymoon,” added the insider.
Nicole Richie and Joel Madden have been dating for over four years and are parents of two children, a 2-year-old daughter, Harlow, and a son, aged 1, named Sparrow.