Lindsay Lohan Reveals Her Skinny Ribcage

She was left devastated by her split from girlfriend Samantha Ronson earlier this month and now it seems Lindsay Lohan's heartache is taking a physical toll too.The Mean Girls actress looked skinnier than ever as she hit LA's Melrose Avenue for an afternoon of retail therapy with her younger sister Ali.Her cream halter-neck sundress hung off her rail-thin frame with the cut-away back revealing her protruding ribcage and sinewy arms.

The 22-year-old looked on edge during the outing, clutching a can of Coca-Cola and biting her finger nails as she stopped to try on reading glasses at an optometrist.Lindsay's weight has yo-yoed dramatically over the years from buxom to skeletal.Her current appearance is reminiscent of her look in 2005, when a friendship with Nicole Richie and super-skinny stylist Rachel Zoe saw her weight plummet.

It seems the stress of heartache could be to be blame for her rapidly shrinking frame.Lindsay and Samantha's turbulent relationship came to a crashing end two weeks ago when the 31-year-old DJ and her family refused to let the actress into a party at Bar Marmont in Hollywood.The 'I Heart Ronson' event was an evening to celebrate Sam’s twin sister Charlotte’s new clothing range.