Sad news for “Terminator 3” star Nick Stahl — TMZ has learned, the actor was placed on a 5150 psychiatric hold last night after being taken to an L.A. hospital.

Sources tell us, Stahl — who has long struggled with drugs, alcohol, and other personal issues — was transported to the medical facility around 3:30 AM this morning by a friend … it’s unclear why.

Details about circumstances of the psychiatric hold are also unclear.

It’s a huge bummer … we spoke to Stahl just last month, and he told us he was finally focused on turning his life around.

Charlie Sheen

has told “Anger Management” producers — FIRE SELMA BLAIR ASAP OR ELSE HE’S QUITTING THE SHOW … TMZ has learned.

We broke the story — Charlie has been on a mission to get Selma 86′d from the show because he believes she’s been complaining about him behind his back … trashing his work ethic.

Now, sources tell TMZ … Charlie returned to work Monday and told producers he wants the termination process started TODAY … or else he’ll walk.

It’s a big threat from Charlie — who’s set to make between $75 and $200 MILLION if he completes the 100 episode order for “Anger Management” … depending on how it does in syndication. We’re told Charlie’s completed roughly half of the 100 episode order. 

We’re told Charlie understands that there can be complications with firing someone from a TV show … but he wants producers to begin drawing up an exit strategy for Blair by the end of the day.

Sources connected to the production tell us … Selma was not on set yesterday, though it’s unclear if she was scheduled to work.

This morning, Blair was spotted out on a walk with her kid — and when asked about her potential termination from “Anger” she just shook her head and replied, “I don’t know anything.”

We’re told FX network execs are currently in talks about how to handle the situation … but it’s unclear if Blair’s fate has been decided.

After days of ridicule, Miss Utah finally had a chance to redeem herself on the “Today” show this AM — and this time she answered the infamous pageant question WITH FLYING COLORS!!! For a beauty queen.  

Marissa Powell sat down with Matt Lauer and explained — as TMZ previously reported — that nerves got the best of her during Sunday night’s Miss USA contest … causing her to give one of the most confusing answers in pageant history.

Matt, being the saint he is, gave Marissa ONE MORE SHOT to get the question right … see how she did this time. And remember folks she only had 48 hours, the Internet and a team of people to help her prepare.

Talk about pressure.

Rapper J. Cole was extorted by a sick fan who tweeted a photo of a little girl with a gun to her head … and claimed he would shoot her if Cole did not respond to his message.

The fan tweeted last night “@JColeNC retweet me and I’ll buy Born Sinner. Don’t retweet me and I’ll kill my lil sister.”

Shortly after the threatening tweet, which refers to Cole’s new album … Cole did indeed retweet the message.

It’s unclear if the gun is real or where the twisted bastard behind the tweet actually lives. The account, which we’re not revealing, claims to be out of Saudi Arabia — but the truth is it could be anywhere in the world.

We reached out to police in North Carolina — where J. Cole lives — to see if they were investigating … but they hadn’t heard anything about it.

We also contacted Twitter headquarters … a rep said the company doesn’t comment on individual accounts to protect privacy

This morning J. Cole commented about the incident, saying … “Wildest s**t I ever seen on twitter.”

11:15 AM PT  The fan is now downplaying his tweet by claiming it’s a BB gun in the photo — apparently, oblivious to the fact even a BB gun could seriously harm a child at that range.