16 Celebrity Siblings Who Could Totally Pass For Identical Twins

Both Mamie, 33, and Grace, 30, followed in mom Meryl Streep's footsteps to become actresses, and the resemblance between the two of them is uncanny. They also have a little sister, Louisa, and an older brother, Henry.

Brandi and Miley Cyrus might only be half-siblings (they share the same mom, Tish Cyrus), but their big eyes and smiles are carbon copies of one another.

Jaden and Willow Smith, 18-years-old and 16-years-old respectively, are beautiful humans thanks to the flawless genes of parents Will Smith and Jada Pinkett-Smith. They'll also make you do a double take when you realize just how alike they look, despite their 2-year age gap.

Thirty-eight-year-old Rachel McAdams is the eldest of three siblings. Although she and brother Daniel definitely look similar, it's her resemblance to sister Kayleen, a celebrity make-up artist, that really has us seeing double.

The music industry stood no chance against Beyoncé, 35, and little sister Solange, 30. Not only do they both have flawless vocal chords, but also twice the good, matching looks.

If you put a blonde wig on Gwyneth Paltrow's little brother, Jake, they would be twins. Just imagine it for a second.

Dakota Fanning wowed audiences with her precocious, wise-beyond-her-years performances on the big screen for years as a little kid, so it makes sense her younger sister, Elle, would be just as talented. The two blonde beauties might differ in height (Elle is taller), but there's no denying how alike they look.

What do you get when you mix curly brown hair with crazy-good guitar skills? The Mayer brothers, who we strongly feel should start a music act together.

Penélope is one of Hollywood's biggest A-list actresses, but she didn't have to look far to find a body double while filming Pirates of the Caribbean: On Stranger Tides in 2010; she just called up her little sister, look-alike, and fellow actress, Mónica.

Ansel Elgort, 23, shares more than looks with big brother Warren. Ansel is one of the most in-demand young movie actors at the moment, while Warren is a director, cinematographer, and producer. Hollywood clearly can't get enough of them.

Lupita Nyong'o had the cutest date at the 2014 Oscars when she rolled up with her brother, Peter. If you don't see a resemblance between the two right away, check out photos of Lupita wearing glasses — they're a pitch-perfect match.

With matching cheek bones and dark features, 21-year-old Stella and big sister Vanessa, 28, are always the coolest people on the red carpet.

Rashida and Kidada Jones were given identical freckles, eyes, and smiles from parents Quincy Jones and Peggy Lipton.

On top of being able to claim Melissa McCarthy as a cousin, Jenny McCarthy can also boast having a look-alike sister. With her blonde, wavy hair, 44-year-old Amy McCarthy — Jenny's junior by four years — might leave you with double vision.

Angelina Jolie's big brother, James Haven, might have freaked people out with their infamous kiss at the 2001 Oscars, but there's something even weirder going on: they're clones. OK, OK, maybe not, but between their matching eyes, lips, and dimples, it's hard to miss their striking similarities.

When the Beauty and the Beast actress wears her hair short, she and her younger brother, Alex, are pretty hard to tell apart.