An announcement has been made that pop princess Britney Spears is set to hold a press conference on Thursday, but even her closest aides have no idea what she's going to announce.

Britney has invited several media representatives, journalists, and record industry executives to the Los Angeles Convention Center.

Although the singer has not officially revealed what the subject matter of the press conference will be, people in the know are guessing she will officially announce her second pregnancy with husband Kevin Federline.

The couple have been plagued by persistent rumors of relationship problems and have not been seen together in the past few weeks.

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