1. The Pitt We Don't Hear About
Hollywood A-list star Brad Pitt probably gained more clout by being with Angelina Jolie than his brother Doug Pitt has amassed in his whole career. We hardly hear about Doug because he likes to stay out of the limelight and lives a quiet life in his home state of Missouri.
2. Lady Gaga Has A Well-trained Fashionista Sister
You may think that Lady Gaga is a big fashionista, but her younger sister Natali Germanotta is a real fashion fiend who studied fashion in NYC. Gaga admits that as daring as her style is, it's a whole different to her sister's, claiming "some of the stuff she wears, I'd be like 'No, never.'"
3. The First Smith Son
Before Willow and Jaden, Will Smith had a son named Trey Smith, who has largely shied away from the limelight. Like his father and two siblings, the 27-year-old pursued a career in music and was first seen in the music video Just The Two Of Us. Unfortunately, he hasn't found big success.
4. The Kardashians Have A Secret Brother
The Kardashian-Jenner clan is already enormous, but there's one brother who hasn't been keeping up - Brody Jenner. He appeared in MTV's The Hills, but since its final episode in 2010, Brody sought to stay out of the limelight and was gradually left estranged from his family.
5. Rihanna's Brother Rajad Fenty
The island queen has a younger brother named Rajad Fenty who is rarely talked about. Being busy with music and her makeup line, the singing sensation doesn't get much time to spend with her brother. Even so, the two are really close.
6. Tom Cruise Has A Sister
We know Tom Cruise is a great actor and a cultish Scientologist, but you may not know that he has a sister named Lee Ann Mapother DeVette, who has served as his publicist on and off for most of his career. He's very close to her, and apparently, it was his sister who taught him how to kiss!
7. Steph Curry Vs. Seth Curry
Surely you know Steph Curry, the MVP and NBA legend, who can literally shoot from anywhere? But did you know that he has a younger brother named Seth Curry who also plays in the NBA? Though Seth isn't as freakishly talented as his brother Steph, he has the same shooting touch.
8. J-Lo's Sister Lynda Lopez
The stunning entertainer Jennifer Lopez is always in the limelight. But have you heard of her younger sister, Lynda Lopez? Lynda is a former New York television journalist and is also a single mom.
9. Miley Cyrus' Sister Noah Cyrus
Miley Cyrus has a 19-year-old sister, Noah Cyrus, who has been out of the limelight for most of her life. But in recent years, she has launched a surprisingly promising pop and acting career. Since her debut single Make Me (Cry) in 2016, her music career has been on its way up.
10. Taylor Swift's Younger Brother Has A Passion For Film
Taylor Swift's younger brother Austin Swift might only be famous by proxy, but he is well on his way to becoming an actor. The 25-year-old landed a role in the Pierce Brosnan film I.T. in 2016. Austin credits his sister's tenacity as a major inspiration.
11. Selena Gomez's Little Sisters Are Too Cute
This pop icon has two adorable little sisters, Gracie Elliot Teefey, who's five years old, and Victoria "Tori" Gomez, who's four. We don't know whether her sisters will follow in her footsteps or not, but it's obvious they idolize their gorgeous, talented big sis, and why not?
12. You May Not Know The Youngest Bieber Yet
Like Gomez, Justin Bieber has two little siblings, too - an 11-year-old sister named Jazmyn and a 10-year-old brother named Jaxon. Jazmyn is poised for YouTube success with her Jazmyn Bieber Show, and Jaxon has been already started hamming it up for the cameras.
13. Beyonce Has Two Unknown Half-siblings
The R&B queen has two little half-sisters that lead normal lives - Koi Branscomb and Nixon Knowles. The two are the result of affairs Beyonce's father Matthew Knowles had with two different women. They stay completely out of the public eye.
14. The Real Slim Shady?
Growing up on 8 Mile in Detroit, Eminem can rap circles around anyone. What you might be unaware of is that Eminem has a brother named Nathan Kane Mathers, who was sent to live in foster care when he was ten years old.
15. Not A Twin But Still Looks The Same
Mary-Kate and Ashley Olsen have been stars since they were kids starring in Full House. But you may not know about their sister Elizabeth Olsen! Elizabeth started making a name for herself as an actress in 2017, trying to step out of the shadows of her successful sisters.
16. The Lawrence Siblings
The funny Jennifer Lawrence has two bearded brothers - Blaine and Ben. When asked what her brothers do, she's at a loss for words, answering, "God, I don't know. It's something with computers. It's something called Louisville Geek I think. I think he goes to an office?"
17. Give Me Some Advice, Bro
Can you believe that Zac Efron has a brother named Dylan? Zac said, "We live together, and we're different in a lot of ways, but he's really grounded. He lived a more normal life than I did growing up, so he's a great barometer for me."
18. Ariana Grande's "Big Brother"
Ariana Grande has an older half-brother by the name of Frankie James Grande. Frankie is an actor, dancer, singer, producer, television host, and a YouTube personality. He might not be as famous as his sister, but he's made a name for himself as a contestant on Big Brother.
19. Ryan Gosling Has A Sister Almost No One Knew About
When Ryan Gosling took his sister, Mandi, as his date to the 89th Academy Awards, the internet lost its mind, and her flawless outfit landed her amongst the headlines. Mandi leads a relatively private life, and she's very talented in her own right behind the scenes.
20. When Two Become One
Louise Adams is the younger sister of Victoria Beckham, aka Posh Spice. While Victoria may be known for her sharp sense of style, Louise has been photographed all over the world wearing chic fashions. She now has her own small boutique called Hidden Closet.
21. No Help Needed From Sister
Some may think with a famous sibling your foot is automatically in the door for success. But that isn't always the case. Sofia Vergara is the star while her sister, Sandra Vergara has insisted on working hard on her own to make a name for herself.
22. This Wizard Has A Brother
Emma Watson has been a star since she played the young and zesty wizard Hermione Grainger in Harry Potter. While her biggest fans might be aware, others may not know that Emma has a model brother named Alex Watson, who has done campaigns for Burberry.