On his wrist he has inked a blue heart dedicated to his new flame and their budding romance. Does that mean things are already pretty serious, then?!
Singer Casey made the revelation while appearing on Celebrity Juice alongside the rest of the Stereo Kicks boys.
On the show - set to air tonight on ITV2 - Keith can be seen quizzing Casey and his bandmate Jake Sims over their reported rivalry with Betsy-Blue.
Joking with the funny panel show host, Jake told him: "Well [Betsy] saw me in Bermuda, and I had the shades on and was swimming, and she got quite high maintenance and was like, 'Get a tattoo for me, get a tattoo…
"I wasn't stupid enough, but Casey actually got a blue tattoo for Betsy-Blue. That's not a joke! He'll probably show you actually."
And on cue, Casey then switched places with Jake on the panel, showing of his latest body ink - a blue heart etched onto his wrist.
Explaining the reasoning behind his tattoo, Casey said: "Yeah, but she's my girlfriend so it's different, we're going out... it's a blue heart because her name's Betsy-Blue."
After filming for the show, Casey then took to Twitter just to clear up that Jake was in fact joking when he hinted he had romanced Betsy first.
He tweeted: "Just to confirm Jake never had a thing with Betsy he was bantering. Don't take it to seriously guys!"
Just to confirm Jake never had a thing with Betsy he was bantering don't take it to seriously guys! ✌️— Casey Johnson (@CaseyCodyJ) April 9, 2015
The boyband star first met girlfriend Betsy while both were competing on last year's series of The X Factor.
Despite Casey first auditioning as a solo act, he was then put together with seven others to from Stereo Kicks at bootcamp.
The boys then went onto take fifth place in the competition, with Betsy and her band Only The Young finishing in seventh place. The series was later won by Simon Cowell's act and former Van Driver Ben Haenow.
Celebrity Juice airs tonight at 10pm on ITV2.
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Watch the Stereo Kicks perform the Backstreet Boys' 'Rock Your Body' on The X Factor: