Trey Songz got off pretty light after going crazy and tearing up a stage at his show in Detroit ... injuring a cop in the process.

The singer pled guilty to 2 misdemeanor charges of disturbing the peace for destroying gear and throwing debris when his set was cut off at Joe Louis Arena in December. Charges of aggravated assault and resisting and obstructing a police officer were dismissed as part of his plea ... according to Wayne County prosecutors.

Trey was sentenced to 18 months probation, and has to go to anger management classes and submit to drug tests. He also has to pay restitution.

Gotta wonder, though ... does he still think it was worth it?

Tina Fey annihilated Donald Trump on 'SNL' with the help of sheet cake and a grilled cheese sandwich.

The UVA grad, class of '92, made a pretty spectacular appearance on 'Weekend Update,' taking aim at the Prez, the neo-Nazis and Ann Coulter, whom she called "Yard Sale Barbie."

It's hilarious and serious at the same time. She uses the cake to show how people are feeling both powerless and powerful ... something that is easier to understand with the help of frosting.

It's pretty awesome. Watch.

Arnold Schwarzenegger has a message to the neo-Nazis -- YOUR HEROES ARE LOSERS and they're all rotting in hell. 

"I knew the original Nazis, because you see, I was born in Austria in 1947," Schwarzenegger said in a brand new video directed at the hate groups. 

"Growing up, I was surrounded by broken men ... men who came home from a war filled with shrapnel and guilt. Men who were misled into a losing ideology. And I can tell you: that these ghosts you idolize spent the rest of their lives living in shame."

"And right now, they're resting in hell."

The ex-CA Gov. says the neo-Nazis are lucky to live in a country where they have the right to say horrible things ... but they should cut the anti-Jew stuff and "use that power for good."

Sofia Richie appears to be playing in dangerous territory ... because Kourtney Kardashian's already peed in that sandbox.

Sofia was spotted with Younes Bendjima Thursday at Liquid Juice Bar on Melrose, and they were being undeniably flirty ... but we're told they're just friends, and have been for a while.

We saw the 23-year-old French model strolling the streets of Saint-Tropez, holding hands with Kourtney in July. Before that, they were rubbin' each other on a yacht.

Exclusivity ... definitely overrated.

Aaron Carter is a man who just came out as bisexual but is now in hot pursuit of women who will pleasure him.

The singer was leaving Delilah in WeHo Thursday night with fellow pop star Porcelain Black when he was mum on everything except oral sex.

Now the plot thickens ... we got Aaron earlier in the day at LAX, where he talked about a dalliance with a dude when he was 17 but, now that he's come out publicly, he's not in the market for men.

Try and connect the dots.

Mel B has traded up from Eddie Murphy by dating a real-life Beverly Hills cop ... so says Torrei Hart.

We caught up with Torrei outside a beauty salon Thursday night in L.A. and we triggered something in her memory bank ... the dude she saw Mel B with at yoga the other day is Mel B's new bf.

TMZ broke the story, Mel B has been inseparable from the officer for the last few months, despite her saying on 'AGT' that she is proudly single.

Torrei threw significant shade in Eddie Murphy's direction, and made it clear ... money isn't everything.

How does Joanna Krupa celebrate her divorce becoming final? Dinner with her ex, of course!

The model and her ex, Romain Zago, were in the mood for some Thai and hit up NaiYaRa restaurant in Miami, just hours after finalizing their divorce. Some very close friends were also in tow for what we're told was essentially a farewell toast to their 4-year marriage.

Joanna and Romain remain friends -- their drama-free divorce is proof of that. We're told they may also be business partners down the road because they discussed as much over dinner.

And how friendly are they really, ya might ask? Romain picked up the entire tab.

Either someone needs to break the news to Drake his Hot 100 streak has come to an end ... or he knows and just threw down the gauntlet.

We got Drizzy leaving TAO Thursday night in Hollywood and our photog brought up his run of 431 straight weeks on Billboard's Hot 100 list. He debuted with "Best I Ever Had" back in 2009 and had reigned ever since, until this week.

So Drake either doesn't know he's off the list, or he thinks he can reset things and go 500 straight, which would take him to 2027.

Kris Jenner took in a comedy after dinner -- a question about her youngest daughter getting married.

Kris was leaving Nobu Los Angeles Thursday night with bf Corey Gamble when a pap asked if Kylie's boyfriend, Travis Scott, has her blessing to join the family ... and she thought it was hilarious.

Hard to say how the couple should feel about Kris' reaction. On one hand, Kylie's only 20 so her mom may just think it's ridiculous to think about her tying the knot.

On the other hand ... ouch.

Travis should probably stick to giving Kylie butterflies for a while ... and hold off on a ring.

The Laguna Beach PD's not putting up with crap from "America First" protesters this Sunday, and it's got everything to do with Charlottesville -- get out of line, head straight to jail.

Law enforcement sources tell TMZ ... Laguna Beach PD has put the word out to the organization ... there is a "zero tolerance policy" for Sunday's rally, where demonstrators will demand tougher border policies. Cops have said they will not give warnings on Sunday ... demonstrators who go where they should not go or break the law by fighting, throwing objects or inciting violence will go to jail.

The cops are making something else clear ... their no tolerance policy applies to all sides ... people demonstrating and people protesting the protesters.  

The Department has reviewed other recent demonstrations that got out of hand, and it's concluded that warnings don't nip things in the bud and it's harder to get things back under control.

The LBPD says they are in full support of the First Amendment. People can demonstrate as long as they obey the law and the rules. They want to make sure the town still functions around the demonstration, and anyone who tries to disrupt will get a new set of cuffs.