Check this out…SUSAN OLSEN . . . better known as Cindy Brady from “The Brady Bunch” . . . was doing a radio interview in Colorado Springs Colorado on Thursday morning.

Susan was hyping a comedy club appearance that was going down that night.  But then she admitted she’d had a little too much to drink at a bar the previous night . . . and proceeded to almost THROW UP in the studio.

She had to cut the interview short in order to dash out of the studio and find a place to yak.

What’s even worse . . . Susan’s 12-year-old son was in the studio with her . . . and he didn’t seem to be fazed by any of this.  He even told the audience to, quote, “watch her drink like a pig” at the bar that night.  (???)