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When you're a Hollywood star, appearance is everything.
Since then, K-Stew, 23, who's shooting movie Sils Maria in Berlin, has been seen wearing a series of hats while out and about, possibly to hide bald patches.
A source tells us: 'Kristen's circle are so concerned about her that two of her friends have flown to Germany to see her.
'They want to take her to a de-stressing yoga retreat on the outskirts of Berlin.
'They've also begged Rob to visit her on set.
'They fear the stress is getting worse because she's been trying to make contact with him and he's ignoring all of her calls.'
SEE PICTURES Robert Pattinson and Kristen Stewart - a love story in photos