Can you use fat from another person other than your own?

It's a good question! Unfortunately, only your own fat will do. Your body would reject your husband's fat and destroy the cells. All of the volume would go away. If you don't have enough fat, you could consider getting 10-15lbs before a BBL surgery. 

The fat will be rejected from another individual unless that individual is an identical twin.  Thinner patients are often very good candidates in experienced hands.Kenneth Hughes, MDLos Angeles, CA