If you don't already know, a particular viral Twitter trend has gotten everyone talking lately. The "how it started vs how it's going" challenge shows us how far someone has come by comparing photos of them at the beginning with them today. And it's proving to be quite the hit. Even celebrities are taking part in the challenge, revealing just how different things once were for them. Come with us on a journey through the best "how it started vs how it's going" comparisons.

Some of the world's best-known celebrities made it big by themselves. They ventured out into the world alone and became self-made millionaires. Others were a little more blessed. These famous faces had won the genetic lottery of life and were born into wealthy family dynasties. Still, they didn't just rest on their families' privileged trust funds. So check out the richest heirs and heiresses, who were born with a silver spoon, but still spun their own fortunes.

Sometimes the best way to tell a story is to dive back into a person's past and show their history first hand. That's why in TV and movies alike, flashback scenes, prequels, and origin story films are often imperative in fully developing a story. To do this right, casting the right young actor is key. They need to not only look the part but their performance also needs to match their older costars. Here are some of the best casting choices that we have encountered thus far. But don't take our word for it, take a look at these perfectly cast younger characters and decide for yourself if they fit the bill.