DesignDeath (Picture I took of Heidi at Brent Cross Shopping Centre on February 2, 2013 in London, England.) CC-BY-SA-3.0 [http://creativecommons.org/licenses/by-sa/3.0/], via Wikimedia Commons
Heidi's normal weight is slightly under weight the normal range for someone Heidi's height is 108.6 LBS to 136.2 LBS depending on their build. where as for example you have Amanda Seyfried who is 1/2 taller and has natural C-D cup breasts depending on weight as she's gone as low as 108 LBS notably for the movie Les Miserables in which she played an abandoned peasant girl around 1840 her breasts are currently bigger because she's nursing her 4+ month old daughter. she has said her daughter weighed 6 Lbs 10 Oz at birth in the early morning hrs of March 21st. granted Seyfried is half an in taller than Heidi a healthy BMI is between 19.9% fat and 24.9% fat