Ariana Grande's life changed forever when a terrorist attack claimed the lives of 22 fans at her Manchester concert in 2017.
The singer hosted a benefit concert, One Love Manchester, weeks after the attack at the Old Trafford Cricket Ground, and raised £10million for the victims.
But despite her best efforts to come to terms with what happened, it seems Pete Davidson's ex-girlfriend is still suffering.
The star made this clear when she shared a now deleted post to Instagram, showing the difference between a 'normal' brain and one of someone suffering from PTSD.
Ariana then displayed her own brain scan, which showed the extent of the PTSD she's now suffering from after what happened.
She wrote that it was "hilarious and terrifying" and assured fans this was "not a joke".
GALLERY: Ariana Grande's dating timeline
Ariana Grande's relationship timeline: Her complete dating history SLIDER heat
1 of 8Ariana Grande and Graham Phillips (2008-2011)
Ariana and Graham met at 15 years old when they were both starring in the Broadway production of 13: The Musical. They dated for three years and released a song called Stick Around together in 2010. Ari continued the trend of duetting with partners later in her career, but more on that later.Is he on thank u, next? Nah, mate.
2 of 8Ariana Grande and Jai Brooks (2012-2014)
Ariana dated Jai Brooks - a member of Australian prank-pop band The Janoskians - between 2012 and 2014. Things didn't end on good terms, though; as Jai accused Ariana of cheating on him with The Wanted's Nathan Sykes very publicly on Twitter. Ariana denied the claims, before the pair briefly got back together for a couple of months in 2014.Is he on thank u, next? Nope.
3 of 8Ariana Grande and Nathan Sykes (2014)
Following that Jai Brooks drama, Ari and Nathan got together as they collaborated on the track Almost is Never Enough; taken from her debut album. The pair split just months later, with many reports claiming Ari wrote Break Your Heart Right Back about the split.The pair are still on good terms and released a second duet - Over and Over Again - in 2016.Is he on thank u, next? No, but he's fine with it. In an interview with TMZ Nathan explained it's 'good' he didn't get a mention, whatever that means.
4 of 8Ariana Grande and Big Sean (2014-2015)
Ariana and Big Sean made their public debut on the GRAMMY red carpet in 2015. Much like Nathan and Ari, the pair have two duets together; 2013's Right There and 2014's Best Mistake. The couple reportedly split due to busy schedules, but they remain 'good friends' and Ari confirmed he heard thank u, next ahead of its release.Is he on thank u, next? Yep, the opening line 'thought I'd end up with Sean, but it wasn't a match' is about him.
5 of 8Ariana Grande and Ricky Alvarez (2015-2016)
Following her split from Big Sean Ariana dated one of her dancers, Ricky Alvarez, for a year. He's the guy she's hanging out with in that infamous doughnut shop video, remember? Neither party have explained the cause of the split, but they remain on good terms.Is he on thank u, next? Yup. The line 'wrote some songs about Ricky, now I listen and laugh' refers to many tracks on her 2016 album Dangerous Woman; including Knew Better/Forever Boy. He's cool with it, though; taking to his Instagram story to praise both Ariana and the track.
6 of 8Ariana Grande and Mac Miller (2016-2018)
Ariana dated the late Mac Miller (real name Malcolm McCormick) from 2016-2018. The pair originally collaborated on her debut single The Way back in 2013 and released another track - My Favourite Part - in 2016. Mac famously supported Ariana at her One Love Manchester concert in 2017 following the Manchester Arena terror attack and split earlier this year after she debuted No Tears Left to Cry at Coachella.Mac tragically passed away on 7th September 2018, and Ariana has since paid tribute to the rapper.Is he on thank u, next? Ariana describes Mac as an 'angel' on the track in a fitting tribute to the late star.
7 of 8Ariana Grande and Pete Davidson (2018)
Ariana and SNL comedian Pete Davidson proved the whirlwind romance of 2018. Just weeks after getting together, the pair announced their engagement in June 2018. The pair split in October 2018 but remain on good terms.Pete addressed their break-up on SNL, saying: "The truth is, it's nobody's business. Sometimes things just don't work out. She's a wonderful strong person and I wish her all the happiness in the world."Is he on thank u, next? Yep. 'Even almost got married, and for Pete I'm so thankful' is obviously about their whirlwind romance.
8 of 8Herself. YAAAS.
In thank u, next Ariana serves some unapologetic feminism as she claims she's now in a relationship with herself. YAS, queen.
The Manchester attack isn't the only catastrophic blow Ariana has been dealt with in the past few years.
Last year, her ex-boyfriend Mac Millerpassed away at the age of 26 just months after their relationship ended.
Then her relationship with fiancé Pete Davidson broke down and the pair went their separate ways in October 2018.
Ariana has made no secret of her anxiety, speaking openly and honestly about the extent at which she suffers.
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Speaking to Vogue last year, the thank u, next singer said, “I think a lot of people have anxiety, especially right now. My anxiety has anxiety.
“I’ve always had anxiety. I’ve never really spoken about it because I thought everyone has it, but when I got home from tour it was the most severe I think it’s ever been.”
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She also told ELLE that following the attack, her symptoms became physical for the first time.
"When I got home from tour, I had really wild dizzy spells, this feeling like I couldn't breathe,” she said.
"I would be in a good mood, fine and happy, and they would hit me out of nowhere. I've always had anxiety, but it had never been physical before. There were a couple of months straight where I felt so upside down."