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Justin Bieber, Seth Rogen, James Franco

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Seth Rogen did not hold back during his guest appearance on Watch What Happens Live last night.

The funnyman stopped by Andy Cohen's clubhouse with Dave Franco and the two spilled some pretty ridiculous tidbits about their friends in Hollywood.

During a skit called "Spill the Herbal Tea," Andy asked Seth to reveal a list of the co-stars that he's smoked weed with—and his answers were pretty surprising!

Here's what he revealed about the list of famous faces he's acted with:

James Franco "This is really depressing for me to say…I've never smoked weed with James Franco because he doesn't smoke weed. That's why he's such a good actor! It's really sad, actually."

Sarah Silverman "Yes, lots of times."

Paul Rudd "Oh yeah, lots of times."

Snoop Dogg "Yeah, actually I have!"

Barbara Streisand: "No, but we talked about it a lot. She smoked weed with Peter Sellers though. That's the craziest s--t ever!"

Jonah Hill "Yeah, a few times."

But the candid moments didn't end there. Andy then asked Seth to further address his recent dig at Justin Bieber over Twitter.

"In my opinion, Justin Bieber is a piece of s--t," he said on the live show.

"He's obnoxious, he's ungrateful, he's insincere. He puts people's lives in danger."

Hmmm…looks like he still feels just as strongly about the pop star as he did earlier this year.

(E! and Bravo are both part of the NBCUniversal family.)