The newly-reunited couple both attended the Jog On To Cancer event on Thursday evening (9 April) but arrived separately meaning we couldn't get a photo of them both together!
Lydia turned up with TOWIE co-star Ferne McCann, while Arg was pictured arriving solo.
Fans of TOWIE know about Lydia and Arg's long history together - a history of amazing moments and some less than fantastic ones, including Arg cheating on Lydia.
But on the 14th series finale, they decided to give their relationship another go after Arg promised he was a changed man and Lydia admitted she couldn't imagine a future without him.
Arg presented Lydia with a list of women he'd cheated on her with to give her closure and allow her to move on from the past without worrying anything would come out of the woodwork.
Speaking to the TOWIE official website later, Arg said: "I was nervous about Lydia's reaction to my list but she was fine, she took it well. The fact Lydia is willing to put it all behind her and move forward means a hell of a lot to me.
"It's amazing that we're back together now and moving forward. It's a happy future for us, I'm sure there will me. Keep strong, keep together and keep doing what we're both doing and I think we'll spend the rest of our lives together."
Take a look at Arg's transformation from then until now: