"Her friends say she need to slow down and take better care of herself, because she forgets to eat," an insider told the publication.
"The stress of juggling so many projects is clearly taking a toll. And she tries to blow off the rumours to Keith being in trouble, but how can that not add to the stress?" they add.
According to the insider, Nicole 'clearly looks too skinny.'
"She'll put the weight back on but her friends and colleagues do worry," they add.