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Nick Cannon, Amanda Bynes

NBC Photo: Ali Goldstein, Twitter

Nick Cannon has already shared his concern for his "little sister" Amanda Bynes, but after recent events, the celeb decided to try and reach out to his All That costar through an open letter.

"As 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," Cannon said.

The TV host and actor stated that he used to "brush it off," but after Bynes' was admitted for psychiatric care, he said, "I see this as no laughing matter."

Mariah Carey's hubby continued to say that although "fame and entertainment is one of the best and easiest occupations to ever have," it can also swallow a person up if they don't know how to navigate through, what he calls, the "matrix."

"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 wrote.

"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."

Nick Cannon, Amanda Bynes

Nickelodeon, nickcannon.com

Nick wanted to make sure that Bynes knew he was only a phone call away, if she ever needed it.

"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."

Last week, E! News confirmed that Bynes was detained by police and taken into custody for a mental health evaluation after being "involved in a disturbance in a residential neighborhood," and ultimately placed on a 5150 hold.

A few days later, a judge granted Bynes' parent's request to have the 27-year-old starlet's temporary psychiatric hold extended for up to two weeks, while they attempt to secure a conservatorship.