Rapper Lil' Kim is passing the time in her Philadelphia federal prison cell by writing new songs.

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Fellow inmates told the New York Post that after six weeks in jail, Kimberly Jones has enough material to fill several CDs when she's released next year.

"She's writing a lot of music in there," said Maricela Cuvlye, an inmate who was released last week after serving six years. "She spends lots of time in her cell by herself, just to write."

Another inmate told the Post: "She's always happy and she's always singing," one inmate said.

Lil' Kim began serving her year-and-a-day sentence in September. She was convicted of lying to a grand jury investigating a 2001 shootout outside a New York radio station.