 During the week of September 25 , 2005 , Carey set another record , becoming the first female to occupy the first two spots atop the Hot 100 , as " We Belong Together " remained at number one , and her next single , " Shake It Off " held the number two spot . Additionally , the song held the top position on the official Hot 100 Airplay chart for sixteen weeks , tying for the second all time spot with No Doubt 's " Don 't Speak " ( 1996 ) . " We Belong Together " was certified Platinum by the Recording Industry Association of America ( RIAA ) , denoting shipments of a million copies throughout the United States . On the Billboard Hot 100 Year @-@ end Chart of 2005 , the song was declared the number one song , a career first for Carey . Billboard listed " We Belong Together " ninth on The Billboard Hot 100 All @-@ Time Top Songs and second on Top Billboard Hot 100 R & B / Hip @-@ Hop Songs . The song was also declared the most popular song of the 2000s decade by Billboard , which makes Carey the first artist to have more than one song being the most popular of a decade , as " One Sweet Day " was the most popular song of the 1990s . 
