Mischa Barton no longer counts calories.

The 26-year-old actress has seen her weight fluctuate in the past but she has now found her perfect size - a UK size 10 - and has told friends it's a relief not to be on a constant diet.

A source told heat magazine: ''Mischa's grown tired of doing extreme fasts and cleanses to try and drop weight quickly and then putting it all back on. She's healthier than ever, following a vegan eating plan - but she's not calorie counting.

''Mischa's been through the wringer with her body. Her weight has massively fluctuated over the years, after falling off and on the diet wagon, but now she's giving herself a break.''

Last year, Mischa has said she was pleased with how she looks, saying: ''I'm proud of my body. I eat healthily and sometimes I pig out. But I exercise regularly.

''Everybody has things that they are conscious of. I talk about this with my girlfriends all the time. We work out and we eat healthy and we do what we do. I feel very comfortable. You are what you are as a woman.''