The former The O.C. star became engaged to her actor beau in December, 2008 after meeting on the set of 2006 movie Jumper.
Speculation about the couple's impending nuptials has been rife in recent months following reports of a secret wedding and pregnancy - which were both subsequently denied.
Now Bilson has been forced to quell fresh talk the stars will exchange vows in a low key ceremony on Christensen's remote ranch later this year (10), insisting she's yet to organise anything to do with her nuptials.
She tells People magazine, "There are no (wedding) plans."
A rep for Bilson adds, "No dates have been set."