Ali Lohan's appearance has changed drastically over the years -- just like her big sis Lindsay! -- and although we usually dig her evolving looks, we're not sure about this new 'do!

The up-and-coming model recently chopped her hair and debuted a cutesy bob, but when she went on a coffee run today, it seems she forgot to flatiron her tresses... oops!

Little Lohan recently returned to LA after accompanying her sister to NYC for her Saturday Night Live hosting gig. The sisters still managed to fit in some bonding time with a shopping trip to Rag & Bone though. Wonder who footed the bill?

The 18-year-old catwalker, who has a contract with Next Model Management, might be going for a more edgy look with her curly coif, but we think she should follow in Lindsay's footsteps and spring for some extensions!