The Daily Grind Video

Rob Kardashian was blowing trees with Rihanna, while her ex-boyfriend Chris Brown partied across the room!

PHOTOS: Rihanna and Chris Brown At The Same Club At The Same Time

The three stars were all in attendance during the grand opening of the Pink Dolphin, a new L.A. hot spot, when RiRi and Rob were caught passing a blunt to one another. 

PHOTOS: Rihanna and Rob Kardashian Go For A Ride

Rob might have wanted to take his mind off the terrible time he had during a recent family interview with Oprah. During last night’s episode of Keeping Up with the Kardashians, the 25-year-old reality sibling recalled the awkward moment that left him feeling like a second-class citizen. 

“First it’s like a group photo. And then it goes – my mom and Bruce, Lamar and Khloe, Scott and Kourtney…and then it’s…Oprah and just Kim.”

When it was his turn to take pictures with the queen of chat, he was lumped together with his baby sisters Kendall and Kylie Jenner.

“Then I’m like on the end and Kendall’s towering over me,” he says. “I don’t even want to be a part of this.”

Nothing like chilling with Oprah to make you need to puff-puff-pass with a hottie like Rihanna. Check out the footage below and enjoy a few flicks from the dope party at Pink Dolphin.