Janet Jackson is praying for Britney Spears because she fears the pop superstar's problems aren't over yet.

The Nasty singer can't help feeling that Spears' recent rehab stint is only the start of things to come as the pop star struggles to fight back after a terrible 2006, which ended with divorce and a series of party problems.

She says, "I'm really afraid something's going to happen, and I hope it doesn't."

Jackson, who first tasted success when she was a kid, fears Spears is suffering now because she had "too much too soon".

She tells Vibe Vixen magazine, "I don't know her, I don't want to assume anything, but who knows?"