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12/20/2012 05:43 am ET Updated Dec 20, 2012

'Late Show': Was Seth Rogen Able To Convince Barbra Streisand To Smoke Weed With Him? (VIDEO)

Seth Rogen went on "Late Show" to promote his new movie, "The Guilt Trip," but David Letterman mostly wanted to talk about marijunana. The host wanted to know how it works, how to buy it, how to smoke it. And perhaps most importantly, he wanted to know if Rogen had been able to light up with his co-star, Barbra Streisand.

"She wouldn't smoke weed with me," Rogen admitted. "I tried, but she wouldn't do it. I don’t think she would've functioned well on it, honestly. She’s kind of an over-functioner as it is."

But if she wouldn't smoke with Rogen, then Streisand has apparently mellowed in her later years. According to Jezebel, Babs told Rolling Stone in the '70s that she used to smoke weed for the calming effects. Probably battling the stresses of being an over-functioner.

Catch Seth Rogen and Barbra Streisand starring in "The Guilt Trip," in theaters now. "Late Show with David Letterman" airs weeknights at 11:35 p.m. EST on CBS.

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