Michelle Trachtenberg is being remembered for the positive energy she brought to set by many of the stars she worked with over the years … after her death was announced today.

Numerous stars have taken to social media to show their love for the late actress, sharing stories from their times working with her.

Kenan Thompson posted a pic of the two from way back in the day … calling her the first Nickelodeon movie star — as well as one of his close friends.

Alyson Hannigan — who appeared alongside Trachtenberg in numerous episodes of “Buffy the Vampire Slayer” — shared a picture of the two together and said she exuded loving energy at work.

Others added their own tributes … including Kim Cattrall, Snooki, Lele Pons, Matt King, Shane Dawson, Iris Apatow, Shawn Ashmore, Brandi Glanville and many more bold-faced names.

A big takeaway from a large swath of the tributes online … many are thanking Michelle for being an integral part of their childhoods.

Michelle was found unresponsive in her New York City apartment Wednesday … and, first responders pronounced her dead at the scene. A source told us Michelle had a liver transplant in the past year — unclear if that played a factor in her tragic death.

She was 39.

Jay Leno is responding to Monica Lewinsky’s claims that he went especially hard on her after her affair with Bill Clinton hit the headlines in the ’90s.

Sources close to Jay tell TMZ he didn’t target Monica personally back then — he says she was just an easy punchline and fair game, since she was everywhere in the news at the time.

Addressing Monica’s claims from Tuesday’s “Call Her Daddy” interview with Alex Cooper, sources say Jay wouldn’t call it unfair — she was often the butt of the jokes, but no one was out to get her personally. It’s just that, in comedy, sometimes people get hurt.

That said, our source tells us Jay couldn’t apologize or be sincere about it because, well, that was the news at the time — and that’s what they did in the late-night game.

We’re told Jay gets why Monica’s upset, but reminded us we live in a different time now, and he hasn’t mentioned her name in 30 years — and it’s not something he’d joke about today.

Brianna “Chickenfry” LaPaglia’s been real open about her messy breakup with Zach Bryan — and she’s owning it all, including $12 million he allegedly offered her to keep quiet.

We caught up with the Barstool Sports star at LAX Tuesday, and she made it clear — she’s got no regrets about passing on that multimillion-dollar NDA, calling it “devil’s money” … and telling us she doesn’t need anyone else’s dough.

You have to watch the full video — Brianna was straight-up repulsed by the money talk … saying she doesn’t need that offer because she’s more than capable of making her own bag.

But she’s officially swearing off musicians, hoping that one day she’ll end up with a guy with some more low-key qualities.

Basically, Brianna wants anybody but Zach — they broke up in October after about a year together, and she accused him of emotional abuse and infidelity post-split.