She's not quite the straight-laced star you think she is. During everyone's favorite gossip-inducing "Plead the Fifth" segment of Watch What Happens Live, Gwyneth Paltrow admitted taken drugs.

When host Andy Cohen asked, "What is the hardest drug you've ever taken?"

Gwynnie simply stated with a sly smile, "Ecstasy."

We half expected the au natural star to say something like: Diet Coke or processed sugar -- but it seems like the consciously uncoupled star has partied like a rockstar.

Maybe Party Paltrow will be chillin' with Miley and Bieber in no time?!