Celebrities who overcame tough backgrounds and upbringings to achieve success are always inspirational. After all, everyone loves a survivor and thriver.
But some stars have such harrowing, dark, and heavy pasts that it is truly amazing how far they've come to get where they are today.
MUST-SEE: 16 Celebs You'd Never Guess Grew Up Poor
See some of their most incredible then-and-now photos and stories below.