LOS ANGELES (Reuters) - Whitney Houston's last recording - a new duet with "American Idol" winner Jordin Sparks - was released on Monday ahead of the singer's upcoming film, "Sparkle." "Celebrate," produced by R. Kelly for "Sparkle" which will hit movie theaters on August 17, was recorded by Houston shortly before her sudden death aged 48 in February. The uptempo track features disco beats and a positive message, as Sparks and Houston sing lyrics such as "I'm going to celebrate, celebrate you." Sparks throws in "We love you Whitney" at the end of the song. ...