Here's what people say 21 celebrities were really like in high school

"[I] had a family friend who went to high school with Ariana Grande," wrote Redditor AshleyScared. "[She said Ariana] would always pick on kids she thought were inferior to her."

Redditor herdana had a similar tale: "[I] currently go to the same school Ariana Grande graduated from. I know a lot of people who were in classes with her, and my sister was in the grade above her. One of my friends said she was a real obnoxious b----, and apparently bullied some other kid on the bus."

Grande has previously said she was the one who was bullied in school: "I was in every group. I suppose I was a bit of a nerd, but I also had a group of friends, too. I knew what it was like to be popular, but I also knew what it was like to have my heart broken by bullies."

According to one Redditor: "My cousins lived near Ashton Kutcher and went to school with him for a bit. He also worked at a restaurant with my aunt. They all say he was a super chill guy and a sweetheart. My aunt has run in to him a few times when he's been back home and he's always been really nice. So that's cool." 

"[A] friend of mine went to school with Taylor. Said he was fine, but [he] cheated off her in math sometimes, [and] they would have friendly conversation and joke around," Redditor itme0001 wrote. "But once graduation happened he was done with everyone and ignored them when they tried to say hi." 

"I went to school with Dwayne 'The Rock' Johnson at Freedom [high school] in Bethlehem, [Pennsylvania] and he was actually a really nice guy when he transferred during junior year,"  Redditor vLT_VeNoMz wrote. 

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"Not high school, but I went to [junior] high with Demi Lovato," wrote Redditor SatansPlace. "She was always super popular and had a reputation for being a bully. Some girl was always crying over something she did. But it was [junior] high, so we were all a--holes. Got to see her sing at a talent show once." 

For what it's worth: Lovato once told People that other people bullied her when she was younger. 

"I had a really tough time when I was in middle school," she said. "People would write 'hate petitions' [about me] and send them around to be signed [...] They’d come to my house, stand across the street and yell things. It was a very emotional time for me, and all I wanted to do was get away."

"I was at school with Nicole Kidman in Sydney in the early 1980s," one Redditor wrote. "She was not in my group but there was a lot of cross over. She was really smart and was semi-famous even before she left school, but was ordinary in many ways. It's great she has found international success." 

"I actually went to the same high school as Micheal Cera," wrote Redditor RoninCorp. "Totally chill guy, was really quiet in person." 

"Chad Michael Murray went to my [high school]," Redditor track-whore wrote. "He's always been full of himself." 

Redditor Prof198106 agreed, replying: "As did my brother in law. D----e status confirmed." 

For what it's worth, Murray has said high school wasn't a good fit for him, according to IMDB:

"I was roommates with Emily Ratajkowski for a five-week art program. It was in San Francisco, I was 17 and she was 16, we shared a bunk bed and dorm room," Redditor iamafoxiamafox remembered. "She was nice, a great artist, kind of Valley Girl-ish, but pretty down to earth.

"She actually had kind of a tough time making friends within the program, like she wasn't interested in doing so," the Reddit user went on. "She had a skate rat boyfriend from back home that came to SF during the program, so she kind of just did her own thing with him all the time. We had a conversation once where she said she couldn't really decide whether she wanted to pursue modeling or art [...] Anyway, guess she chose modeling." 

"My partner was in the same grade/school as Margot Robbie [...] Apparently she was known for being pretty and somewhat popular, but not one of the super popular people," wrote Redditor Psychology Lover. "There are these backstory rumours that say she was so into Harry Potter she wore glasses to look like him, but both my partner and sister are like, 'No that's bulls--t.' So I think she has these origin stories that are trying to make her seem more relatable to nerdier/geekier fans of hers."

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At least according to Redditor nomadismydj, who knew Kanye when he was a college student. "Kanye and I had about three mutual friends when he was in college for a minute and working at the Gap," they wrote. "At that point in time, he knew he had talent but wasn't over the top about it [...] Decent guy to be around." 

"Penn Jillette was a year ahead of me in high school," wrote Redditor Tracfabber. "He was tall and wore a long black coat, had long curly hair and did magic tricks and stuff. He was cool and a nice guy." 

"My mom knew Patrick Swayze. He ended up marrying one of her good friends growing up," Redditor something-dangerzone recalled. "She said she liked him well enough, always had an ego, though. His mom ran a dance school [...] and I guess he knew he was good and was always a flirt and could be obnoxious, but wasn't necessarily a bad person if you asked her." 

Swayze got to show off those dancing skills when he starred in "Dirty Dancing" in 1987.

According to Redditor GrapMmollack: "My grandmother went to school with Richard Simmons. From what she told me, he's extremely similar to the way he is in his exercise instructional videos. He's also a comedian, and it seems he's always been a pretty spunky guy. Very kooky, I might add, but my grandmother had a crush on him for a while." 

"My older cousin was in the same class as Adam Sandler in high school," wrote Redditor Sleeptalkerz. "He says Sandler was pretty much like he acted later on in his movies. He was the kid in school who wasn't necessarily a jerk, but was kind of a wise a--." 

"I went to high school and was friends with Howie Mandel," wrote Redditor rberg57. "I remember him dressed up in a gorilla costume and running down the hall. He was super hyper. Having a convo with him was exhausting. Never really got close to him, [because] he seemed to be in character all the time."

"My mom was good friends with Björk," wrote Redditor nadicee. "They used to go horseback riding a whole ton. She was pretty chill and was a down-to-earth kind of gal. A generally nice person and didn't seem to really dislike anyone."