Mackenzie Phillips’ Shocking Confession About ‘One Day at a Time’

Mackenzie Phillips just revealed that she and her “One Day at a Time” castmate were doing cocaine between takes on set. Yeah, you read that right.

In a candid chat, Phillips opened up about her wild days on the hit sitcom, admitting she struggled with serious addiction while filming. But here’s the thing — she made it clear that her co-star Valerie Bertinelli wasn’t battling the same demons. “Valerie talks about it openly,” Phillips said, emphasizing that Bertinelli didn’t have the same drug problem she did.

Phillips has been pretty public about her past substance abuse issues over the years, so this isn’t totally out of the blue. But hearing the specifics about what was actually going down on a beloved ’70s sitcom set? That’s a whole different level of tea. The show ran from 1975 to 1984 and was a massive hit, so knowing what was happening behind the scenes is pretty wild.

Bertinelli has spoken openly about her own struggles in the past — mainly around alcohol and personal issues — but it sounds like Phillips’ addiction was on another level entirely during those days.