Alyssa Milano

In the wake of the recent mass Las Vegas shooting, the deadliest in U.S. history, gun control is once again a subject of fierce debate.

'ALL those who defend our right to live freely should be able to serve freely! There are THOUSANDS currently serving!' Perry wrote.

There is no love lost between Hollywood and Donald Trump.

Little Mix, Madonna + Halsey also gave a nod to sisterhood.

From Sia to Rosie O'Donnell to Kim Kardashian, here's how stars are standing up against Trump's immigration ban.

The origin series ran from 1998 to 2006.

Julia Louis-Dreyfus addressed what's at stake for climate change, Alicia Keys pushed for love over hate and Zendaya said, very simply: VOTE!

These TV co-stars did a really good job pretending they didn't hate each other once the cameras were rolling.