The on-off couple were guest of honours at Freeport Braintree shopping village on Thursday evening (13 November).
Sharing a photo with fans, an excited Arg said: "At @FreeportEssex with my @LydiaRoseBright where we have just switched on the Christmas lights!"
Bella Sorella boutique owner Lydia looked ever-so-chic in a loose fitting blouse and leather-look mini skirt. Meanwhile, Arg smartened up in a navy blue striped blazer, which he teamed with burgundy trousers.
Lydia also shared photos on Instagram, telling fans that she and "Argy Bargy" had successfully turned on the lights.
There's no denying that Arg and Lydia looked pretty smitten as they cosied up together for a few photos.
Arg wooed the crowd as he performed a set, including festive favourite 'Let It Snow'. He also serenaded Lydia with 'Can't Take My Eyes Off You', and the pair enjoyed a little dance on stage. Ahh!
TOWIE's 13th series wrapped up on Wednesday with Bobby's charity gala, which included a Full Monty-themed strip show, to round off an eventful few weeks.
However, Arg was not featured in the series finale, following his recent suspension from the ITVBe reality show.
Two weeks ago, TOWIE confirmed that Arg had been barred from the show amid claims that bosses were fed up of his partying. A week later, a rep confirmed to Reveal that he was "suspended until further notice", meaning he missed out on the last few episodes.
Viewers last saw Arg trying to convince Lydia that they should give their relationship another go and make things official.
It appears that Arg's presence has been missed during filming though, with Big Mark Wright tweeting after Wednesday night's show: "Where are you Arg, not the same without you mate!! #SortIt."
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