Credit: John W. Ferguson/Getty Images.

The details of Alec Baldwin's big day are on a need-to-know basis.

The "30 Rock" star is expected to wed his yoga instructor fiancee Hilaria Thomas Saturday at downtown Manhattan's St. Patrick's Old Cathedral. The New York Post reported that because the happy couple is wary of paparazzi - Baldwin scuffled with a New York Daily News photographer last week - they have yet to tell guests where the reception will take place.

But a source close to Baldwin told ABCNews.com that's nonsense. "Everyone knows where to go," the source said, adding that while Baldwin and Thomas didn't send out traditional wedding invites, "the idea that they are not telling people" details "is just not true."

Whatever celebrations happen won't last long. Thomas is scheduled to be back at her yoga studio on July 2, Baldwin is set to host documentary film festival on July 6 in East Hampton.

This will be the first wedding for Thomas, 28, and the second for Baldwin, 54. He was previously married to Kim Basinger, they divorced in 2002 and have a daughter together, Ireland.