Sorry, Seth Cohen. But your one true love may turn out to be the much-hyped mother to someone else's kids.

Rachel Bilson has been booked as a special guest star on the 100th episode of How I Met Your Mother.

Late last month, producer Craig Thomas said this legendary installment of the sitcom would represent "the closest Ted's ever come" to discovering the identity of his future wife.

Thomas also told Entertainment Weekly producers are “spending a lot of time trying to cast the female role in Ted’s story for episode 100."

Does this mean Bilson has hit the mother lode with her role? Or, like Sarah Chalke and Jamie-Lynn Sigler, is she merely another tease? Tune in. Find out.

We certainly will.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.