Nick Cannon
is reaching out to his former costar, Amanda Bynes.

The actor posted an open letter to Amanda on his website. Referring to the troubled starlet as his "sister," Cannon shared some kind words with the actress who's had a tough year (to say the least).

Bynes has shown serious signs of erratic behavior in the last few months, with her actions coming full circle when she was put on a 5150 hold in July. Since the "Easy A" star has been hospitalized, she's been diagnosed with a form of mental illness.

Nick decided to post the letter after being asked about Bynes in recent interviews (the two worked together on Nickelodeon's sketch comedy "All That") -- check out some excerpts from the empathetic post below:

"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," Cannon writes.

"The question is, when this destruction occurs, who is there to help put back the pieces. What do you do when you have no solid support system?"

Adding, "Then you have to rely on your own devices once again in this vulnerable state. You become paranoid, frantic, manic, irrational because you can bounce your thoughts or ideas off of anyone anymore. Your reality no longer allows you to reason with the world, so you try to break through to get back to what you think is common ground."

"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," Cannon finishes.

It's nice to see that Amanda has celebrity friends in her corner -- we hope she has a speedy recovery, and that the 27-year-old comes back stronger and healthier than ever.

What do you think of Nick's letter? Tell toofab in the comment section, and check out some of Amanda's recent Twitpics in the gallery below.

To read his full post, check out nickcannon.com.

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