Jennifer Aniston

"I don't think there was a sensitivity like there is now."

Both stars worked with the twin actors when they were children.

It's no surprise Jennifer Aniston's hair — a.k.a. "The Rachel" — made the list.

From friendly specters to demonic houseguests, these stars have played host to ghosts.

But was it really?

"Jennifer’s pretty much sold it to me that she’s not a morning person."

"We just literally channeled everything into Ross and Rachel."

From Charlie XCX to Brittany Spears...

Jennifer Aniston may have hated it, but we loved "The Rachel" and we want it back. Like, really want it back.

The beloved cast reunites at the studio where it all began.