Whoa! This could be serious!
The interview is being taped today in Armstrong's Austin, Texas home.
The source said he's going to admit but he won't be going into details of the allegations that got him banned from cycling for life!
If you're thinking he could find himself in hot water with lawsuits and sponsors following a confession, he's already thought of that.
The statute of limitations has already passed on his sworn testimony denying doping in a 2005 fight against a Dallas promotions company.
Hopefully he just airs it all out because the truth can set him free! Or at least help his public image a little!
[Image via WENN.]