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Nick Cannon wrote a heartfelt letter today to his former All That co-star, Amanda Bynes, and in the lengthy note on his website, he offers her help and tells her she's "not alone."

Bynes has been on a 5150 hold after trespassing and allegedly starting a fire on a property in Thousand Oaks, California on Monday, July 22, and her parents appeared in court last week in an attempt to gain a temporary conservatorship over her. A hearing for the conservatorship has been set for August 9.

In "[A]n open letter to my sister, Amanda Bynes," Cannon writes, "[A]s of lately I have been hit with an onslaught of questions about someone I consider family, someone I watched grow up, and someone I genuinely feel is one of the most pleasant human beings I have had the pleasure of meeting, Amanda Bynes."

"[A]fter recent events of Amanda being admitted under psychiatric care and reported as 5150, I see this as no laughing matter," he continued. "I am always the first to say that fame and entertainment is one of the best and easiest occupations to ever have, but one must know how to navigate through the matrix or you may find yourself in a very dark hole. When a person is told all of their life that they are awesome, the best, the greatest and they are catered to every moment of the day. Imagine being the breadwinner in your household before you can even drive. Imagine you parents, teachers, and employers NEVER telling you NO. Anything you ask for or want, the world gives you, at some point you are bound to self-destruct. I call this 'access to excess.' I’ve seen it happen to many of my friends and colleagues young and old. It goes back to that old saying; 'Too much of anything is bad for anyone.' Whether it’s fame, money, sex, drugs, attention. It’s all a dangerous addiction."

"We all end up alone in that dark hole at some point in our lives and if you don’t have a foundation of friends and family to help bring you up and out it makes that journey long and detrimental," he says. "So I say to my sister Amanda Bynes you’re not alone. I’m here for you. I understand. I care and I appreciate you, because that’s what family does and that’s what family is for."

Click thru to read the whole letter.