Taking to Twitter yesterday (10 January), both Casey and Betsy made sure to mark the relationship milestone with fans, posting a series of loved up snaps and gushy messages about each other to do so.
Betsy was the first to get all sentimental over her beau, sharing several photos of herself and Casey with her Twitter followers. Alongside them, she tweeted: "1 year since this guy asked me to be his real life girlfriend. Happy anniversary. U are my best friend @CaseyCodyJ."
Casey, meanwhile, shared a snap of himself planting a kiss on Betsy's cheek. He told his girlfriend: "HAPPY ONE YEAR ANNIVERSARY @betsyblueoffic I LOVE U GIRL."
The pair first met while both were competing on The X Factor back in 2014. While Casey originally auditioned as a soloist, before becoming a part of boyband Stereo Kicks, Betsy was a member of band Only The Young.
Despite meeting on the talent competition, the couple didn't come clean about their romance until filming for The X Factor had wrapped up.
During a taping of Celebrity Juice in April last year, Casey revealed he and Betsy were an item, after being grilled by host Keith Lemon. He also admitted to having a tattoo dedicated to the blonde beauty etched onto his wrist - a blue heart.
At the time he said: "It's a blue heart because her name's Betsy-Blue."
Since then, Casey and Betsy's relationship has gone from strength to strength - despite both having to deal with their bands splitting up.
Stereo Kicks were first to announce they had chosen to call time on the band, after struggling to get signed by a record label. The eight-piece announced the news in July, telling fans they had tried everything they could to stay together.
Casey has since been gigging with his former bandmate Tom Mann, as well as working on his own material.
Only The Young, meanwhile, confirmed their split in November and appeared to fallout on Twitter over the break up.
Parisa Tarjomani was first to announce the news on her personal blog, explaining to fans she had decided to leave the group and go solo. Betsy, however, was quick to hit back that it was actually a mutual decision.
She wrote on Facebook: "Just want you all to know the truth. As you have all been so loyal to us I feel you deserve better. We have been deciding how to tell you guys that the band was coming to an end for a while - no one decided to just leave. Some people just wanted to give you that impression."
While she implied there were two sides to every story, Parisa tweeted in response that Only The Young hadn't split mutually - leaving us all pretty confused.
Since then, Betsy has been going it alone and not only has she hinted she worked with Kim Kardashian to film a new music video, she recently announced she has signed to the same modelling management as Rita Ora and Ellie Goulding.
Betsy tweeted: "Ecstatic to announce that I've signed with @NextModels - privileged to be joining the likes of Rita Ora & Ellie. An amazing management #2016."
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