"Happy Birthday" is the tenth single of the Japanese boy group NEWS. It was released on October 1, 2008, in two editions; a regular edition which contains two b-sides: Gan Gan Ganbatte and Push On!, and a limited edition which also contains Happy Birthday and its b-side Gan Gan Ganbatte from the regular edition, as well as another b-side entitled Game of Love and an instrumental version of Happy Birthday. Happy Birthday is NEWS tenth consecutive number-one single since their debut in 2004. This single makes them the second group to have this distinction (the other being KinKi Kids, who currently has twenty-seven consecutive number-one singles).
Happy Birthday was written and composed by JapaneseHip-hop artist SEAMO.Happy Birthday reached the number-one spot on both the daily and weekly Oricon charts, selling 201,304 copies in its first week; just 38 more copies than their previous single Summer Time, which sold 201,266 copies in its first week.
The music video for Happy Birthday was filmed using a green screen and cardboard cut outs. The music video is very simple. It features all six-member singing, dancing and playing with the cardboard cut outs.