Lindsay Lohan stepped out looking shockingly thin yesterday.

The actress has sparked further concern about her weight loss, as she continues to exist on what seems to be a diet of caffeine and cigarettes.

The Mean Girls star started her day yesterday with a can of cola in hand as she left Samantha Ronson's Hollywood home.

She then headed out to Maxfields for some retail therapy where she stopped for regular cigarette and cola breaks with a female friend.

As well as her dwindling frame, her bad habits don't appear to be doing her complexion or her teeth any good either.

See an unhealthy-looking Lindsay out and about below