Although Jennifer Aniston has said she and fiance Justin Theroux are in no rush to get married, the star of "We're the Millers," has secret plans that could be for a wedding weekend.

Tomorrow is the Theroux's 42nd birthday, and the couple has reportedly invited friends to their mansion in Bel Air to celebrate somthing, according to PerezHilton.

While it could just be a birthday party for Theroux, it also marks the one year anniversary of when he propsed to Aniston, 44.

The couple has allegedly ordered imported flowers, catered cuisine, and formal invites.  All could match up with a birthday, but it sounds a little more classy than a birthday party!

"They have gone to extreme lengths to keep it quiet - openly lying to their friends to keep up the ruse. Apparently it's going to be a very low-key affair with the possibility of a bigger celebration later on in the year," according to a source.

Apparently sources have speculated a date and been wrong before.  Aniston has said in interviews that they were taking their time.

We just want to do it when it's perfect, and we're not rushed, and no one is rushing from a job or rushing to a job," Aniston told the Associated Press.  She added that they "already feel married."

According to ABC, some tabloids were questioning why they haven't tied the knot already, some reporting that Theroux was doubtful about getting married.  Aniston firmly said those rumors were false, and gave the Associated Press some more details.

"We have yet to set any dates.  There have been no cancelled weddings.  There have been no postponed weddings," the actress said.  "There have been no arguments about where to get married.  Just clearing all that up."