Heidi Montag in 3DDD

2/18/2010 6:04 AM PST BY TMZ STAFF
Heidi Montag -- and all of her brand new refurbished parts -- managed not to melt while standing upright underneath the hot L.A. sun on Wednesday.


In case of an emergency, the 23-year-old may be used as a flotation device.

The hills are alive!