Julia Roberts reveals the 'hardest drug' she's ever taken

Julia Roberts got extremely candid while chatting with Andy Cohen.

The star recently appeared on Watch What Happens Live, which is hosted by Cohen, where she was asked a series of questions during 'Plead the Filth'.

For the game, Cohen challenges his A-list guests to a rapid-fire interrogation.

He asks four questions, only one of which the celebrity can choose not to answer.

One thing he asked Roberts was asked to rank her three biggest movies: Notting Hill, My Best Friend's Wedding and Pretty Woman.

Roberts plead the fifth for this one as Cohen empathized, saying: "They're all so good."

The 56-year-old was also asked about her least favorite Real Housewives star of all time, to which she replied Jen Shah (who is currently serving a 6.5 year sentence behind bars).

Explaining why, Roberts said: "I'm just saying that 'cause she's in prison and I feel safe."

Cohen then proceeded to ask the Hollywood star what's the 'hardest drug' she'd ever tried.

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While most might not have answered, Roberts replied: "Mushrooms."

Sharing more about her experience of taking the drug, the actor said: "Yeah, it was nice, not gonna lie."

"Kids don't try it at home," Roberts went on to urge in the wake of her candid admission.

Roberts has been doing the rounds of late in light of her new movie, Leave the World Behind, dropping on Netflix today (December 8).

The highly anticipated film boasts an all-star cast, with Ethan Hawke, Mahershala Ali, Kevin Bacon and Black Mirror's Myha'la Jael Herrold joining Roberts on screen.

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The film's synopsis reads: "A family vacation on Long Island is interrupted by two strangers bearing news of a blackout.

"As the threat grows, both families must decide how best to survive the potential crisis, all while grappling with their own place in this collapsing world."

As it stands, the film boasts 75 percent on Rotten Tomatoes' Tomatometer and a 65 percent audience score - but this is subject to change in the wake of it having just been released.

"It’s an unsettling, well-acted experience with layers and cautionary warnings to spare," one critic said of the movie.

Another wrote: "Leave the World Behind is a thrilling work of apocalyptic tension, utilizing a stellar cast & Netflix budget to widen the breadth of the novel."

It sounds like it could be one of Netflix's more successful recent releases in the wake of the streamer's festive films The Family Switch and Best. Christmas. Ever! being slammed by some viewers.