Mischa Barton credits staying slim to healthy eating and running

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.

The 25-year-old has been telling friends that her key to staying slim is "eating really healthy, keeping a mostly vegan diet and running," the New York Post reported.

Barton was spotted at Prime 112 Thursday night having a light dinner with friends and later at the W South Beach for drinks.