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He's a comic by trade, but Russell Brand wasn't in a particularly humorous mood in his native England on Friday.

The British Arthur star, 36, looked gaunt and stressed departing London's Savoy Hotel, bound for Heathrow airport and a flight to Los Angeles.

His estranged wife Katy Perry popped up for the very first time since Brand's shocking divorce filing Dec. 30 on Thursday -- smiling and showing off dyed-blue hair with Eric Berlanger, a fan, following an Adidas commercial shot in Santa Barbara, Calif.

In the wake of their split, recovering drug and sex addict Brand has been "working hard to stay clean," focusing on his 12-step sobriety programs, one insider says.

Perry, meanwhile, is ready to move on from their 14-month marriage, another pal told Us. "She wants his stuff out of their house in Hollywood."