Rihanna is set to take the stand as a witness against Chris Brown in his preliminary hearing today, with the festivities starting at 1:45 PM PST (4:45 EST).

Suffice it to say, her testimony is hugely important, an could potentially make or break the case against her ex-boyfriend. All bets are off at this point.

A few burning questions for today's hearing:

* Will she stick to the story she told cops the night of the alleged beating? Rihanna said Brown had beaten her before and the violence was escalating?
* Will Brown's lawyer, Mark Geragos, cross-examine Rihanna?
* Additionally, if the case goes to trial, will Geragos argue that she was the initial aggressor, repeatedly hitting him before he began pounding on her?
* Will the photo of Rihanna's battered face be admitted? Or the pics that were supposedly taken the next day - after the bruising and swelling settled, and looked even worse - that were not leaked to the press?

The judge has rejected TV or livestream coverage for today's hearing, but we will be posting updates with additional information as it becomes available.