Lindsay Lohan Parent Trap Class(Via Tumblr)

There are some celebrity sisters who look so much alike they could pass for twins. Then there are those sets of famous sisters that you stop and think, “are you sure they’re related?” You can’t really see any similarities between them. Perhaps they could pass for cousins, but sisters, you aren’t so sure about. These celebs may share the same last name, and know the same embarrassing family stories, but the similarities end there.

(Related: Lindsay Lohan And Her Sister Ali Look So Different Now, The ‘Before And After’ Will Make You Say WTF)

Here are six sets of celeb sisters who don’t look related:

1. Rumer And Tallulah WillisTallulah And Rumer Willis

(Via Instagram/Buuski)

It isn’t just the Willis sisters’ unique styles and different haircuts that make them look different. Rumer takes after mom, Demi Moore, while Scout and Tallulah seem to take after their dad Bruce Wills‘ side of the family.

2. Zooey And Emily Deschanel181388676CC00040_Fox_Broadc

(Via Charley Gallay/Getty Images)

This is one of those cases where two celebs share the same last name, but you never put the clues together to realize they were related. Why would you? You would expect Zooey Deschanel‘s sister to have an equally thick fringe and a manic pixie dream girl wardrobe.

3. Cara And Poppy Delevingne Chloe Delevingne and husband Ed Grant leaving their wedding reception in Mayfair, which was also attended by sisters Poppy and Cara Featuring: Poppy Delevingne,Cara Delevingne Where: London, United Kingdom When: 07 Feb 2014 Credit: Will Alexander/WENN.com

(Via WENN)

Cara and Poppy Delevingne and blonde and beautiful models, but they are gorgeous in their own unique ways. Translation: Cara got the bold eyebrow gene that Poppy didn’t. Furthermore, their other facial features are very different. 

4. Kim, Kourtney And Khloe Kardashian151997522ZD00038_KOURTNEY_K

(Via Michael Stewart/Getty Images)

We know it. Kim and Kourtney Kardashian know it, and Khloe definitely knows it. And the thousands of “does Khloe have a different father?” stories know it. Khloe looks different than her older sisters thanks to her lighter hair and skin, and height. In throwback photos, Kim and Kourtney could pass for twins, while Khloe stands out because of her curly hair.

5. Lindsay and Ali LohanLindsay Lohan Ali Lohan 2014 before and after

(Via WENN)

Lindsay and Ali Lohan used to look very similar, but the march of time–and various makeovers–have resulted in them looking quite different from one another. Mom Dina could pass for Lindsay’s sis, before Ali could.

6. Lily And and Ruby AldridgeLily Ruby Alridge

(Via Instagram/Ruby Aldridge)

Lily and Ruby Aldridge are both models but they probably don’t have to worry about being mistaken for one another at casting calls. Yes, they’re both gorgeous, brunette and tall, but they have different facial features, as well as personal styles.