Taking to social media, Lydia made sure to celebrate their anniversary, telling her beau she will love him "always and forever".
Reflecting on her romance with Arg, the Essex beauty shared a picture from when the pair first met alongside one of the couple now.
She told fans: "Seven years ago today, I met this one at the Duke of Essex Polo. Never did I ever think that we would be where we are today. We battled some storms and jumped many hurdles. But despite everything we made it this far. You love me unconditionally, charm everyone with your infectious personality and make me the person I am today.
Love you always and forever. Happy anniversary x."
She then added on Twitter: "7 years ago today, I met @RealJamesArgent you mean the world to me & I am so proud of you."
On seeing his girlfriend's posts, Arg was quick to wish Lydia a 'happy anniversary' back, referring to their tumultuous relationship by tweeting: "Aww I love you so much @LydiaRoseBright. Happy 7th year on/off/on anniversary lol x."
Childhood sweethearts Lydia and Arg first got together when the pair were young, splitting in 2012 after rumours surfaced Arg had cheated. Following a year of not speaking or seeing each other, the couple then grew close again after Lydia returned to TOWIE.
However, Arg's concerning behaviour - that saw him suspended from the ITVBe reality show last year - meant things became strained between the pair.
Since seeking treatment at rehab and embarking on a healthier and sober lifestyle, Arg has managed to win back Lydia and viewers watched the reality stars rekindle their romance earlier this year.
Since then, Lydia and Arg have insisted this time their romance is forever. Not only have the pair moved in together, but Lydia and Arg have often been heard discussing marriage too!
Despite seeming as loved-up as ever though, fans were left concerned after Lydia and Arg fell out during last night's episode of TOWIE.
Arg had upset his girlfriend by having a drink on a night out and then accusing her of being unfaithful. Confiding in her co-stars, Lydia told them: "The reason why I'm p***ed off is he's f***king drinking again. No one knows what I'm dealing with with that boy.
"He was implying that I had been to after parties and was paranoid that I had been with other guys... Regardless of what he's put me through, I treat it as a fresh relationship. Don't accuse me of things I would never dream of doing."
Later, she and Arg met to talk through their recent issues. Insisting she won't put up with his behaviour lately, Lydia told her beau: "I'm not having my life being a rollercoaster where you're being vile. I've become your girlfriend, your counsellor, your mother and that's not my roles."
Arg then apologised for upsetting her, telling Lydia he won't drink again and will try and make more of an effort.
Fingers crossed he sticks to his word!
TOWIE continues Wednesday 8 July at 10pm on ITVBe.
For exclusive competitions and amazing prizes visit Reveal's Facebook page NOW!