Mark Ruffalo

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.

From Katy Perry to Joe Biden, celebrities gushed over Lady Gaga's debut Halftime Show headlining performance across social media on Super Bowl Sunday.

Rose McGowan, Leonardo DiCaprio, Susan Sarandon and more also celebrated on social media.

Celebrities like Shailene Woodley, Mark Ruffalo, Pharrell Williams and more have lent their support to the Standing Rock Sioux Tribe in opposing the controversial Dakota Access Pipeline.