We've shared lists about celebrities with some tragic pasts before, but not all of the secrets about your favorite stars are upsetting.
You may be surprised to learn that some of Hollywood's most talented actors have equally impressive family members.
Sometimes the family resemblance is so close you'll kick yourself for not realizing this sooner, but in other cases it's downright impossible to spot.
See how many of these famous families you already knew about!
1. Kate Hudson's parents are Goldie Hawn and Kurt Russell
Let's start off with one Hollywood family some people already know about. The Bride Wars star is Hollywood royalty, with a movie star mom and step-father.
2. Jenny McArthy and Melissa McArthy are cousins
Talk about a funny family! These two comediennes even share throwback memories of the days before they were famous
3. Alexander Skarsgard has a famous father
If you loved True Blood you'll recognize this TV star, but remember his dad Stellan? He had roles in big films like The Avengers and Good Will Hunting.
4. Al Roker and Lenny Kravitz are distant cousins
These two are as close as you can get to total opposites, so it's surprising that they're actually related. The weatherman is connected to the rocker through their grandparents.
Click the next page to learn about some surprising celebrity siblings!