Just because someone is blood related doesn't mean they always have to like each other, or even stand each other. Having a brother or a sister is like constantly having someone to compete with. It doesn't necessarily mean they don't love each other, sometimes a sibling rivalry just means they're constantly trying to outdo one another.

Celebrity sibling rivalries seem to be of a different breed. They have to keep being more famous than their siblings. If they don't, then they lose their bragging rights for the family Christmas celebrations. These feuds aren’t anything like the fights normal people get into with their siblings. We’re talking about downright dirty battles that you would never expect from blood relations in the spotlight. Check out these 20 famous siblings who can't stand each other

20 Aaron And Nick Carter

File this one under yikes! The Backstreets Boy and his younger brother have been involved in a public war of words for a while now. It's so bad that Nick resorted to taking out a restraining order against his brother, alleging that Aaron threatened his (Nick) wife. Can't these two just make up already?

19 Rob And Kim Kardashian

The Kardashians are prone to fighting and bickering - we aren't complaining, it makes for good TV. One of the biggest Kardashian feuds was probably the Kim and Rob war of words. We have watched the back and forth an exchange of NSFW language between these two. We are on Rob's side on this one, by the way.

18 Madonna And Christopher Ciccone

The two were extremely close at the beginning of Madonna's career, but they stopped speaking just before the release of his 2008 memoir, "Life With My Sister Madonna," in which he wrote extremely private details about the star's love life and hygiene. It seemed the two had made up, however Christopher blamed his sister for his failure in Hollywood again and threatened her with another tell-all book.

17 Liam And Noel Gallagher

The brothers were in the band Oasis together, with the band’s popularity fading due to the duo's decade long feud. In 1994, Liam hit Noel with a tambourine and walked offstage before their performance was over. They still barely speak to one another and sometimes take their feud online for all to see.

16 Caleb Followill And Nathan Followill

Their band, Kings of Leon, had fans in a frenzy thanks to their sultry voices and amazing stage presence. But brothers Caleb and Nathan Followill were involved in a feud of sorts— it is alleged that one drunken night in 2007 climaxed with Nathan dislocating Caleb's shoulder, breaking a $7,000 mirror, and stabbing Caleb's bed with a kitchen knife. Hmmmmm.

15 Charlie Sheen And Emilio Estevez

Charlie Sheen was, for a while, Hollywood's bad boy and built quite a reputation around that image. His brother Emilio, on the other hand, is the exact opposite. While Charlie has always poked fun at Estevez, the latter doesn't publicly respond to his brother's jabs. However, he did once say that all he can do is be a good example to his troubled brother.

14 Alec And Stephen Baldwin

Believe it or not, this feud started when the brothers expressed different political views. Alec was very critical of the President of the United States in interviews and even took it further by mocking the president on Saturday Night Live (SNL), something which Stephen publicly criticized. It was later revealed in an interview that he hadn't spoken to his brother since election day.

13 Kim And Kyle Richards

It's no secret that the duo's relationship has always been kinda rocky, Kim and Kyle starred in the reality TV show, Real Housewives of Beverly Hills where we saw first hand the challenges the two face in their relationship. Kim's alcoholism has played a major role in their never-ending on and off feud.

12 Britney And Jaime Lynne Spears

Being the younger sibling of one of the biggest stars in the world might overshadow your own success, as was the case with Jaime Lynn Spears. They have had a love/hate relationship and don't seem to have a close bond. That said, Jaime Lynn has been defending her sister in the media in view of her recent health troubles.

11 Jermaine Jackson And Michael Jackson

The Jackson brothers' feud stemmed from Jermaine's claims that Michael was purposefully derailing his career, claims which music industry legend Clive Davis backed. According to him, Michael Jackson was also the reason brother Jermaine's musical career never really took off. Michael allegedly tied up producers set to work on Jermaine's album.

10 Jeremy London And Jason London

When Jeremy claimed he was kidnapped by a group of men, and forced to drive around for 12 hours purchasing alcohol and using drugs - like many of us, his brother didn't believe him. Jason went as far as issuing a public statement doubting the events and this didn't sit well with Jeremy, who hasn't wanted anything to do with him since.

9 Julia Roberts And Eric Roberts

The 10 year age gap didn't seem to stand in the way of their close bond, but it all changed when Eric started hitting the bottle hard and developed substance abuse issues. The two eventually made amends 10 years after their feud when Julia gave birth to twins, but sources say they still tend to give each other space.

8 Jessica And Ashlee Simpson

Living in your older famous sibling's shadow has got to be hard, and Ashlee Simpson told us all about it her song "Shadow." It doesn't take a rocket scientist to figure out who the song is about. The two have never been particularly close and seem to have little in common.

7 Kendall And Kylie Jenner

Keeping Up with the Kardashians is chock-full of drama, from meltdowns, to sibling rivalry, and colorful language - it all makes for good TV. The youngest Kardashian-Jenner siblings have never really been close, Kylie has said – “We have different opinions. We do everything differently. It's so interesting. 'I don’t think we’d be friends if we weren’t sisters.”

6 Aaron And Jordan Rodgers

Jordan revealed he hadn't spoken to his Green Bay Packers quarterback brother, Aaron. The reason for their strained relationship has never been clear. Some claim it started when Jordan accused Aaron's then-girlfriend, Olivia Munn, of using him to boost her status. Yikes, we sure hope they can reconcile and make up.

5 Dakota And Elle Fanning

While these two do not hate each other, they don't particularly have a close relationship. Elle admitted that they have struggled with their relationship since their childhood – “When we were little we would fight all the time. I’m taller, so I would be the one beating her up." Interesting.

4 Beyonce And Solange Knowles

For the most part, the duo seem to get along pretty well, and that's why fans were baffled when Solange attacked her sister's husband in an elevator and Beyonce stood there and did nothing! The incident has never been properly explained and we bet the trio has an awkward relationship since the incident.

3 Randy And Jermaine Jackson

This sibling feud stemmed from a love triangle and betrayal. In 1986, Randy met a woman named Alejandra and, while the two never married, they ended up having two children, Alejandra later went on to secretly wed his brother Jermaine and the two later had children of their own. No, we didn't make this up!

2 Lindsay and Ali Lohan

The troubled star is no stranger to controversy and bad decisions. Her life has been extremely public. Her sister, Ali, on the other hand, has stayed out of the public eye. The rivalry between the sisters is one that goes back to Lohan’s mother, who apparently has frequently pitted the girls against one another, and made them compete for her attention.

1 Olivia De Havilland And Joan Fontaine

Olivia and Joan were big stars back in the day. In 1941, both were nominated for Best Actress for an Academy Award. Olivia was nominated for her role in Hold Back the Dawn, while Joan was nominated for Suspicion. They were seated at the same table when Joan’s name was announced. Joan was the first one to win an Academy Award.

Sources: Worldation.com, RollingStone.com, BabbleTop.com, People.com, CheatSheet.com

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