'Little Couple' Star I Kicked Cancer's Giant Ass

2/28/2014 12:30 AM PST

"The Little Couple" star Jen Arnold is a free woman ... free of the cancer that wracked her body.

We got Jen and hubby Bill Klein in NYC ... and they revealed two major spoilers for the upcoming season of their TLC reality show  -- including the latest on her battle with stage 3 cancer.

Check the clip ... Jen and Bill don't actually think they're spoiling anything ... because how can good news be bad?