Christina Aguilera and Jason Mraz will be featured on two Very Special Christmas albums to mark the series' 25th anniversary.
Aguilera, Mraz, Dave Matthews and The Band Perry lead an all-star line-up of artists who will contribute festive tracks to the charity LPs.
Train, Rascal Flatts, Michael Buble, Vince Gill and Amy Grant will also feature on the latest A Very Special Christmas sets.
All proceeds generated will benefit the Special Olympics. More details are expected to be announced at a press conference later today (August 6).
The A Very Special Christmas series was launched in 1987 with a compilation of tracks by Bruce Springsteen, The Pretenders, U2, Sting and Madonna.
Miley Cyrus, Carrie Underwood and Sean Kingston featured on the most recent release A Very Special Christmas 7 in 2009.