Rihanna unveiled her new single "Only Girl (In the World)" on Ryan Seacrest's radio show Tuesday morning (Sept. 7), shortly after announcing the title of her fifth studio album, "Loud," on her official fansite.

"Yes it is called LOUD," Rihanna told fans during a live chat. "Get LOUD everybody. Get crazy. Get excited. Cuz I'm pumped. I'm just gonna be ME."

Photos: Rihanna's Fashion Evolution

"Only Girl (In the World)" aims squarely for dancefloor domination, as the pop star pours her heart out to one man over a full-throttle production by Norwegian hitmaking duo, Stargate. "Want you to make me feel/Like I'm the only girl in the world," Rihanna belts on the chorus. "Like I'm the only one that you'll ever love/Like I'm the only one who knows your heart." Stargate is also responsible previous Rihanna singles "Please Don't Stop the Music," "Hate That I Love You" and her most recent No. 1 hit, "Rude Boy."

If "Only Girl" is any indication, Rihanna's "Loud" will be a departure from the edgier fare of her last album, 2009's "Rated R," which has sold 975,000 copies, according to Nielsen SoundScan. In a recent interview with Billboard.com, Alex Da Kid -- the producer/songwriter behind Eminem's current No. 1 "Love the Way You Lie," which features Rihanna -- said the pop star's new material is "like a mixture of her two sides. It's commercial, but at the same time it's got an edge to it -- it has substance."

Hitmaker Alex Da Kid Talks Rihanna's New Album

Rihanna echoed that sentiment during her chat with fans. "I'm gonna miss the Rated R era too, but NOTHING compares to the album I just made," the singer said, adding, "I wanted the next step in the evolution of Rihanna, and it's perfect for us."

Eminem and Rihanna Still No. 1 on Hot 100