Sheen worried about his boys' safety under Mueller's custody

Charlie Sheen is reportedly "heartsick" at suggestions Brooke Mueller may be granted custody of their sons.

The 'Anger Management' star and the 35-year-old socialite have four-year-old twins Bob and Max from their marriage together - which ended in divorce over two years ago - and he is said to be worried for their safety if they are put under her care.