We've seen our fair share of on/off celebrity romances, but cute-as-a-button couple Justin and Selena really do take the (rusk) biscuit.
Since they first fell into each other's arms more than four years ago, they've endured an fake fan pregnancy, a fight with a photographer, a possible engagement, A LOT of cheating allegations and a trip to rehab.
And they're barely in their twenties.
Take a deep breath and then read the couple's relationship history.
December 2010
Tongues start wagging when the cuties appear on stage together at Dick Clark's New Year's Rockin' Eve.
Gazing into each other's eyes, the chemistry between the then 16-year-old Canadian singer and 18-year-old Disney star is obvious.
February 2011
Singer Selena breaks Belieber hearts all over the world when she's spotted holding hands with Justin as they stroll through Santa Monica.
Later that month, the couple make their first official appearance together at the Vanity Fair Oscars, and a new A-lister pairing is born.
March 2011
Teeny bopper Justin opens up about Selena for the first time and admits that she's his girlfriend.
"She’s hot. Of course every guy likes the girl to be hot, which Selena is. But I like to mess around and pull jokes on people so I like to be around people who make me laugh and share my sense of humour. That’s Selena for sure," he told The People.
"She is a really great person and I think she has the best smile in the world."
August 7, 2011
Just four months after they made it official, Selena apparently dumps her teen beau after reportedly growing annoyed with him keeping dodgy company, such as Sean Kingston and Chris Brown.
"Selena told him to stop hanging with these bad people," says a friend. "They had a huge row and said it was good they were having time apart while she was on tour."
Biebs is said to be devastated over the split, crying and telling Selena he loves her.
August 9, 2011
The pair put on a lovey dovey display at the Teen Choice Awards in LA, with Selena showering now 17-year-old Justin with kisses. It's back on then...
September 2011
Clearly keen to keep his girlfriend happy, the Canadian singer pulls out all the stops on a million-dollar date. He hires a 20,000 seater arena in LA, lights candles and puts a table for two in the centre where they enjoyed a romantic dinner.
Good work Justin!
October 2011
Uh oh! Rumours fly that naughty Justin was spotted sneaking out of South American model Macarena's hotel suite, although she later claimed they'd just had dinner and shared a little kiss.
It doesn't look like Selena is too worried though as they were spotted watching an ice hockey game a few days later.
November 2011
The world shifts on its axis as Justin is accused of fathering a child with 20-year-old fan Mariah Yeater, after the couple allegedly had sex after his show in LA.
Justin's people deny the claim but Mariah's lawyer requests that the popstar does a paternity test, as pictures of Justin's "son" Tristyn appear on the front cover of Star magazine.
Despite the drama, smiling Selena attends the MTV Europe Music Awards in Belfast with Justin, as questions are raised about Mariah's story.
“Selena trusts Justin completely and doesn’t believe a word of the claims. With every passing day more evidence emerges to discredit Mariah," a source said.
Mariah later drops the case against Justin.
February 2012
Selena shares a snap of a diamond ring on Instagram, a Valentine's gift from Justin. The diamonds form the letter "J" - presumably for Justin - and rumours of engagement circulate, although the singer wears the ring on her right hand.
Could the teens be getting married?
March 2012
While promoting his single Boyfriend, Justin talks about his relationship with Selena on Radio Disney.
"It's just about being honest with one another. You just have to be honest, that's the first thing, because if you're not honest then the relationship is just not a good relationship," he said.
"At the end of the day your girl would appreciate you being honest more than lying to her and vice versa."
May 2012
Pictures of Biebs looking all stroppy and throwing his purple trainer to the ground emerge after he gets into a scuffle with a photographer who tried to snap the couple leaving the cinema.
Selena is seen trying to calm the fuming teen star down.
July 2012
As they reach their 18 month milestone, the couple are thought to be on the rocks after apparently breaking up a number of times over the last few months.
"They might be young, but Justin and Selena’s is a very adult relationship," a source said.
"They have had to grow up really fast because of the pressures of their careers. To begin with, their similar situations complemented each other, but now they seem to be drifting apart."
Nov 1, 2012
Justin appears to confirm split rumours when he posts some black and white selfies from his tour, with the words: "Just me". Alongside another moody image, he wrote "Lingse", an anagram of "single". Very cryptic Justin!
Days later, the Canadian is pictured apparently on a date with stunning Victoria's Secret model Barbara Palvin. He's not hanging around.
November 20, 2012
In an attempt to win back his gorgeous girlfriend, Justin arrives at her house with plans to take her out for a slap-up dinner. But it all goes horribly wrong when he ends up locked out of the house, along with a load of photographers.
Somehow, his plan works in the end and they're spotting holding hands together days later.
December 2012
The boomerang romance is on the rocks yet again as Selena is apparently left fuming when a video emerges of her "devoted" boyfriend eyeing up Victoria's Secret models backstage at the fashion show.
Later that month though, it seems the Canadian's smooth tongue has saved him yet again as they're pictured jetting off for a romantic ski break.
February 2013
As if we weren't confused enough already, it looks like the couple HAVE gone their separate ways.
Selena appears to have moved on when she admits she'd like to kiss One Direction heartthrob Zayn Malik, before saying: "I really shouldn't have said that, should I?". She then added: "I'm young and I'm experimenting. I'm experiencing life."
March 2013
While touring the UK, Justin appears to have a meltdown. He twice collapses on stage with breathing problems, fought with a photographer and received a barrage of criticism after turning up two hours late for a concert.
His behaviour - which leads to him apparently attending rehab - is blamed on his break-up with Selena.
"He was crazily in love with her. She kept him grounded," his friend said. "She’s been a tower of strength through all the hysteria of being one of the world’s most famous pop stars. To lose her was like losing an anchor."
April 2013
Upset at reports of Justin's increasingly crazy behaviour, his ex-girlfriend flies from LA to Oslo, Norway, to apparently give their relationship one more go.
My source told me: “Selena’s been worried about Justin and all the trouble he seems to be getting into since they broke up.
"She still really cares about him and has seen how badly the split has affected him," she said. "He asked her to come and join him on his tour in Europe to see if they could give things another shot. It looks like they might be back on track."
May 13, 2013
After Justin posted some pretty saucy snaps of the half-naked pair, Selena throws a spanner in the works by seeming to admit she was single during a radio interview.
When asked by a DJ on Boston Kiss 108: "So sometimes you may see a boy walking down the street and he says, 'Let's grab an ice-cream.' You're available?"
The singer replies: "Yep."
Pushing further, the presenter asked: "You're completely available in every way?"
And Selena replied: "Yep!"
Confused much?
May 20, 2013
More puzzlement as the on/off pair are pictured kissing backstage at the Billboard Music Awards.
Yet Selena seems to be sticking with the split-up line as she gives an interview to InStyle magazine: "I don't know. I'm a kid, and a break-up is normal. I have to go through the emotions and feel it out. I'm doing my own thing, being with my friends, and he's doing very well too."
July 2013
Justin posts a picture with ex Selena on Instagram with the caption: "#heartbreaker." Is he talking about breaking his fans' hearts by getting back together with Selena? Or is that a reference to his new single?
Your guess is as good as ours. Later that month, Justin attends Selena's 21st birthday following accusations he spat on fans.
January 3, 2014
The confusing couple are spotted together for the first time in months, having fun on segways near Justin's Californian pad.
The next day, he posts a snap showing them cuddling, with the words: "Love the way you look at me."
At the same time, Selena cancels a load of concerts and says she's the "happiest" she's been in a while.
January 21, 2014
Following an accusation that Justin had caused $20,000 of damage to a neighbour's house with raw eggs, his home is raided by police.
RadarOnline claims that vile messages between the pair were discovered, including Selena calling Biebs a "drug addict" and his response: "F*** YOU!!!!! I need to grow up? HA ok! Enjoy life with OUT ME B***H."
So we're guessing it's "off" for now?
March 2014
It looks like Justin is trying to win Selena back yet again when he tweets an Instagram snap of the brunette beauty in a gold dress at the Vanity Fair post-Oscar party, with the comment: "Most elegant princess in the world."
While performing in Texas, he dedicates his song As Long As You Love Me to "my baby" as he looks towards Selena, who is standing in the wings.
April 2014
The couple appear to be back on as Selena is pictured dropping in on Justin's recording studio in Miami and they're inseparable at the Coachella Festival, holding hands and slow dancing.
But then the controversial singer posts an Instagram snap of himself in Central Park, with the words: "Was gonna wait to go to Central Park for when I proposed to my future wife but s** sometimes things change," he wrote, before adding: "I'll think of something more romantic."
What does it all mean?
May 2014
Biebs is linked to a series of models including Kendall Jenner, Yovanna Ventura, Chantel Jeffries and Adriana Lima. When a fan calls for Selena to win him back, she says: "Aw you think I care. He'd rather models."
It doesn't make sense but we get the idea.
June 2014
Just when we thought it was all over, Justin throws another Instagram spanner in the works. He posts a black and white snap showing him cuddling up to Selena with the words: "our love is unconditional".
After fans were up in arms, the 20-year-old quickly deleted the shot.
