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Russell Brand wasn't his usual light-hearted self as he stepped out to grab a cold coffee in LA, on Monday.

The star has been grieving over the recent and untimely death of his good friend, Amy Winehouse. Brand even penned a tribute to the late singer, expressing, "Whether this tragedy was preventable or not is now irrelevant. It is not preventable today. We have lost a beautiful and talented woman to this disease."

The Arthur star has suffered publicly with his own drug and alcohol addiction, and his gorgeous wife, Katy Perry, recently confessed she's relieved her hubby kicked the habit before it was too late.

Perry confessed in an interview with ABC News:

    "My husband, who has been clean and sober for almost nine years, I see him working a program and working on himself every single day, and I see how much work it takes to be clean and sober when you have an addiction on your hands. It gave me a real a gratefulness for my husband, who got clean when he was 27."


Read Brand's entire tribute, For Amy, after the jump ...