Mackenzie Phillips says she and Valerie Bertinelli drank wine, did cocaine during sitcom breaks

Mackenzie Phillips is looking back on her "One Day at a Time" years with honesty, humor and a clearer understanding of what was happening behind the scenes.

The 66-year-old actress, who starred as Julie Cooper on the hit sitcom opposite Valerie Bertinelli, told Fox News Digital that one memory from the show’s run might still surprise fans today.

"Oh, I don't know. Oh, okay. So this might surprise you that during lunch break, Valerie and I would drive to my house, get in the pool, drink wine, and snort coke," Phillips said.