Photo, with thanks, c/o Splash News.

Mackenzie Phillips, star of the classic sitcom One Day at a Time star, has had her share of troubles in the past…. She’s been in and out of rehab and arrested numerous times. Ten years ago, though, she cleaned up her act, acquired some more television gigs and even dabbled a bit in motivational speaking.

This morning (Wednesday), however, Mackenzie was arrested by American Airlines’ security when they discovered heroin taped to her body.

Really. Freakin’. Sad.