Beyoncé and Solange Knowles
But I think we can agree that only one of the Knowles sisters "woke up like this":
Chris and Liam Hemsworth
But are you telling me you'd choose that over THOR?!
Britney and Jamie Lynn Spears
The left is lil sis, Jamie Lynn, singing at a country music benefit. The right is international pop goddess Britney Spears onstage doing pop goddess queen diva things. Does this one even require an explanation?
Jessica and Ashlee Simpson
Toni and Tamar Braxton
But be real -- no one could touch Miss "Un-Break My Heart" in her heyday!
Ben and Casey Affleck
Nick and Drew Lachey
Are there any more that we left out? Tell us in the comments section!