Mischa Barton has reportedly been telling her friends that her slim toned figure is all down to healthy eating, keeping a mostly vegan diet and running.

The actress, whose fluctuating weight and questionable fashion choices have been well documented since her breakout role in the popular defunct series 'The O.C.,' flaunted a slimmer, toned shape in a skimpy black bikini while hitting the beach over the holidays in Miami.