Stranger Things

Millie Bobby Brown became the definition of "young love" while watching her pop star BF from backstage -- and after watching this ... you'll be saying AWWWWW.

TMZ obtained video of singer Jacob Sartorius' Wednesday night concert in Atlanta, where his new gal and fellow child star was perched behind a curtain looking on with a big fat smile.

There's no hiding it now -- Millie and Jacob are definitely a thing. The role of backstage girlfriend has been well established in relationships ... just ask Selena Gomez.

The kids from "Stranger Things" got in each other's face ... for an awesome dance-off!!!

The kiddos were getting down Sunday night at the Sunset Tower Hotel for the Netflix SAG Awards after-party ... and leading the way were Millie Bobby Brown and Gaten Matarazzo as Fat Joe's "Lean Back" blared from the speakers.

Actors Lonnie Chavis ("This is Us") and Marsai Martin ("Black-ish") also joined in on the fun. The kids went wild when Cardi B's "Bodak Yellow" came on. Huge little fans for sure.

"Stranger Things" star David Harbour is counting on the camera shaving 10 pounds, instead of adding it, when it comes to his new role as demon superhero, Hellboy.

Harbour had to go through an intense 10-week boot camp, so he could transform from the dad bod he normally rocks to play Sheriff Hopper on 'Stranger.'

When we got Harbour leaving Poppy in West Hollywood, not only was he extremely pumped to see us, but it was pretty obvious his intense training was paying off.

He wouldn't give us a sneak peek of his new rock solid abs, but he did give one of the best TMZ on-camera exits ever.

French model Thylane Blondeau has advice for kids out there being coined "the next big thing" like "Stranger Things" star Millie Bobby Brown, and she knows how to survive the hype.

Thylane walked her first catwalk at age 4 and was dubbed the 'World's Most Beautiful Girl' by age 6, when other kids were just learning to count past 100.

She's now 16 and still crushing it in the biz ... so when she arrived at LAX Tuesday, we asked her to coach up 13-year-old MBB. Thylane's first tip -- move to the South of France.

WARNING: SEASON 2 SPOILER ALERT

Finn Wolfhard aka Mike on "Stranger Things" might've been his co-star Millie Bobby Brown's official first kiss, but she wasn't his.

We got Finn at LAX Friday where he told us about the first time he puckered up all the way back in kindergarten! As for kissing Millie -- Finn says it's all in a day's work.

One of the kids on "Stranger Things" has been so well trained on not giving away spoilers for the new season ... he sounds like a dad telling his kids no dessert before dinner.

We got Gaten Matarazzo, who plays Dustin, and asked if he had just one little juicy tidbit he could share before Season 2 drops in a couple of days.

Besides him saying "It's gonna be good," Gaten hilariously insists on keeping a lid on things -- but he was happy to tell us about the new pressure on the whole cast, now that Season 1 "raised the bar" so high. He also opened up about his favorite stuff from the '80s ... and it's pretty funny.

Way before Caleb McLaughlin's "Stranger Things" character become a hot Halloween costume ... Caleb was slaying chicks with his Halloween swagger.

No doubt the kiddos from the hit Netflix show will be a popular costume idea this year, especially because season 2 drops around that time. So, when we got 15-year-old Caleb -- who plays Lucas -- we asked his fave costume of all.

Let's just say Caleb's Halloween game's been strong since he was a real young tyke!

If this inspires you to be more like Lucas -- Caleb broke down the 3 things you'll need to pull it off.

Matthew Modine does not think Charlottesville and other terrorist attacks are a harbinger of bad things to come ... to the contrary he thinks we are living in the best of times.

We got the "Stranger Things" villain Saturday at M Cafe in Bev Hills, and he blames the perception that our world is crumbling on a 24-hour news cycle that obsesses over the negative.

David Harbour, aka Chief Hopper on "Stranger Things," let a big cat out of the bag Wednesday when he accidentally talked about season 3.

We got Harbour at LAX Wednesday night when he talked about raging hormones on the set. The kids are getting older, and that leads to teenage craziness, especially when they enter season 3.

Hmmm ... was David supposed to mention a third season when season 2 doesn't premiere until October 27? Watch his reaction ... he tries to backpedal, but without much success.

BTW ... he seems like an awesome dude.

Shannon Purser -- who plays Barb on "Stranger Things" -- came out as bi this week, and apologized to fans who thought her show was misleading the LGBT community.

Shannon posted the news Tuesday night in response to online backlash over her show, "Riverdale" ... which fans accused of queerbaiting. If you're unfamiliar, that's when a show teases fans into thinking characters are gay to build an audience, but ultimately they turn out to be straight.

"Riverdale" was accused of doing that with it's characters Betty and Veronica ... pissing off a lot of Beronica worshipers. That's when Shannon got involved.

She posted an offensive tweet a fan sent her -- which Shannon felt harassed by -- and then announced ... she's bi.

"Stranger Things" star Finn Wolfhard paints a horrific picture when it comes to clowns.

The kid actor just finished wrapping the horror flick "It" -- an adaptation of Stephen King's novel -- and explained Thursday at LAX why he's just not about that clown life.

Josh McDermitt can neither confirm nor deny whether he'll be in season 2 of "Stranger Things" ... but does have a funny way of explaining his run-in with the kid stars.

We got the 'Walking Dead' actor Tuesday at LAX, where our camera guy grilled McDermitt about a pic he posted Monday with 3 of the boys from the Netflix show ... with hashtags like #CrossoverEpisode fueling rumors he'll star in the upcoming season.

Like Josh says ... he can't talk about that. But he's happy to deadpan his way through their meetup in Portland.

"Stranger Things" star Caleb McLaughlin had a funny thing happen on his way down to the subway ... an encounter with our TMZ photog, who was itchin' to know about Season 2.

Stephen King might be a master writer of horror, but he's not getting his grubby pen on the "Stranger Things" script ... so says the guy playing Chief Jim Hopper.

We got actor David Harbour out Saturday at the the Four Seasons Hotel in Bev Hills, where he addressed a rumor about King penning Season 2's script head on.