The 27-year-old heiress to the Hilton hotel empire said she and the Good Charlotte guitarist are working together to create a theme song for the upcoming MTV series "My New BFF," People magazine said Friday.

"Benji and I have been working hard on it," Hilton said. "He's helping me write the lyrics for the song and then I'll sing it, too."

The new reality series will feature Hilton attempting to choose a new friend from a group of 20 hopefuls, People said.

In addition to working with Madden on the series' theme song, Hilton said she is preparing a new album to follow her 2006 album "Paris."

"I'll have another album come out, for sure," the former "Simple Life" star told E! News. "I just don't know when yet. I only have the summer off, then I'll be taping another season of 'BFF.' But an album is something I'll do."