"Christmas Tree" is a song by American singer Lady Gaga. It was released on December 16, 2008, for digital download. It was written and produced by Gaga, Martin Kierszenbaum, and Space Cowboy, who also provides guest vocals. Musically, "Christmas Tree" is a Christmas song with dance-pop and synthpop influences. It samples the classic Christmas song "Deck the Halls", as well as briefly using the lyrics "Rum pum pum pum" from the Christmas song "The Little Drummer Boy" in its intro. Lyrically, the song uses sexual innuendos.

Nicolas Jean-Pierre Patrick Dresti, better known by his stage name Space Cowboy, is a French-British singer-songwriter, DJ, and producer. Born in France and raised in England, Dresti first recorded in 1992 under the names of Vibes and DJ Apex, releasing breakbeat hardcore tracks. He then changed his stage name to Nicky Fabulous and produced a four track extended play, Pussy Galore in 1995. He has recorded under various pseudonyms including: DJ Supreme, Kings of Rhythm, Loop Da Loop, and DJ Chrome. In 2002, Dresti changed his stage name to Space Cowboy and did a cover of Prince's song, "I Would Die 4 U." In 2003, Space Cowboy debuted his first studio album Across the Sky. On 22 June 2005, he released his second full-length album Big City Nights and his third album, Digital Rock, the next year. Digital Rock Star, a re-release of Digital Rock, debuted as his fourth studio album on 20 October 2009.