Following every moment of a celebrity's life proves to be even more interesting when they appear to crack under the pressure and have mental breakdowns.

Several celebrities over the years have had meltdowns of some kind, fueled by either poor decision making, a lack of management ensuring they stay out of trouble, or previously undiagnosed mental disorders that suddenly surfaced.

These breakdowns have only become more evident in recent years with the advent of social media, where fans have been able to track the moves these celebrities make and witness what is going on with them on nearly a 24/7 basis. Though celebrities choose to open their lives in this manner, it provides additional scrutiny that can promote the behavior that leads to such breakdowns even more.

Enstars has compiled a list of eight celebrities who all famously had breakdowns at some point.

The first on the list is Sean Penn.

Though the actor hasn't had much of a nervous breakdown, he is known for his anger issues -- especially when it comes to dealing with invasive paparazzi. Back in 2010, the Milk star was charged with battery and vandalism for allegedly breaking a photographer's camera and kicking him in his legs. He was sentenced to probation and community service for the incident. Since then, the actor has become more known for his humanitarian work as a manager of a relief organization and tent camp after the Haitian earthquake, as well as his visit to flood victims in Pakistan in 2012.

Scroll through the gallery to learn about more celebrities that have cracked under the pressure of the Hollywood spotlight.