The news ends long-standing speculation that Piper was planning to quit her role as Rose Tyler at the end of the upcoming second series.
"There are lots of places for Rose to go," said Piper at the press launch for series two, which begins on April 15. "I have had a ball. I might still be here in 40 years."
Commenting on the story, a BBC spokeswoman teased: "All parties want more of Rose Tyler... however it is too early to confirm in what shape, form and how that will be for series three."