Alec Baldwin is keeping his upcoming wedding to Hilaria Thomas top secret by refusing to tell guests where the reception will be held.

The "30 Rock" actor will walk down the aisle with his yoga instructor fiancee at St. Patrick's Old Cathedral in his native New York later this month.

But to ensure the post-church party is kept private, Baldwin will only text his closest friends and family the details of the venue on the morning of his nuptials, according to the New York Post.

His brother Stephen tells the publication, "I'm going. I haven't been told the location yet. That's about all I can say, because he (Alec) can still kick my butt."

The pair has had to complete a marriage course to entitle them to wed in a Catholic church, according to the newspaper.

It will be Baldwin's second union - he married Kim Basinger in 1993 but they divorced in 2002.