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Kylie Jenner, Kim Kardashian

Steve Granitz/WireImage, Michael Bezjian/WireImage

The expression typically goes, "Like mother like daughter," but this time around it's more appropriate to say, "Like sister like sister."

Kylie Jenner attended Rihanna's annual Diamond Ball in Santa Monica, Calif., Thursday wearing a tight nude gown that hugged her curves in all the right places. Kylie made sure to flaunt her figure for the cameras, showing her look off from the front and then turning to the side to reveal her prominent derriere.

And that's when it hit us: She looks exactly like Kim Kardashian. Everything from Kylie's hair to her pose oozes Kim, and we can't get over it! It really shouldn't come as a surprise considering they're related, but the similarities are definitely something to behold.

This entire look, from Kylie's hair to her gown, was definitely one of her more conservative choices as of late. In on photo her long dark hair draped over her shoulders and down her chest, just like Kim used to do before she chopped her locks into a lob. While their outfits may differ, the general look is the same: skin-tight, neutral-colored gowns that show off everything.

Kylie Jenner, Kim Kardashian

Paul Archuleta/Getty Images, Christopher Polk/Getty Images for VH1

Kim attended Rihanna's event last year, which was hosted by Jimmy Kimmel, but was unable to make it this year because she recently gave birth to son Saint West! The family is getting back into the routine of late nights and early mornings, but a source told E! News exclusively that they're all adjusting very well. The insider said, "The whole family is in great spirits as they welcome their new member of the family."

Newborn Saint is a "very happy baby so far" and looks a lot like his famous mom and sister North West. But as we can see from these Kylie similarities, we wouldn't be too surprised if little Nori looks like her, too!

Kylie Jenner, Kim Kardashian

Steve Granitz/WireImage, Denise Truscello/WireImage

"Kim and Kanye [West] are very hands on with the baby and want to be involved in the little things as much as possible," the source added. "They take turns waking up and tending to the baby's needs. It's a lot of work, but they just feel very blessed for having a healthy baby boy."

Congratulations again to the new family of four!

Kylie Jenner, Kim Kardashian

Jon Kopaloff/FilmMagic, Humberto Carreno/startraksphoto.com

Find out why Kim Kardashian went on a Twitter rant—don't worry, it's for a good cause!