In 2008, Hilson appeared in the music videos for Usher's single, "Love in This Club", and Ne-Yo's single, "Miss Independent". Her debut studio album, "In a Perfect World...", was released on March 24, 2009. The album contained pop-oriented R&B songs. It was initially planned to be released the previous year; however, the album was delayed several times because Hilson wanted to make sure it came out to her liking, stating "I'm just a perfectionist. I have had many dates, but it's all for a good cause. The label wants to make sure the album has its proper release, and I'm thankful for that. Very grateful, even though fans look at it like it's a bad thing." In the United States, "In a Perfect World..." debuted at number four on the "Billboard" 200 chart, and number one on the Top R&B/Hip-Hop Albums chart, with first-week sales of 94,000 copies. By October 2009, the album was certified gold by the Recording Industry Association of America (RIAA). Its first single, "Energy", released in May 2008, peaked at number 78 on the US "Billboard" Hot 100 chart and number 21 on the US Hot R&B/Hip-Hop Songs chart. It reached the top fifty in the United Kingdom, and peaked the highest in New Zealand at number two, and was certified gold in that country. Hilson also featured on three singles in 2008; in June, on rapper Nas' song "Hero"; in September, on Kardinal Offishall's "Numba 1 (Tide Is High)"; and thereafter, in October, on Chris Brown's song "Superhuman".