Lydia joined her fellow cast mates at a Barbie and Ken-themed party in Essex and she went the whole hog, swapping her light brunette hair for long blonde locks.
Dressed as a futuristic Barbie, the fashionista was wearing a hot pink mini-dress, which she teamed with a pair of white leather knee-high boots.
Lydia made a shock return to TOWIE at the end of the last series and she has already featured heavily in the Marbella specials, having gone out on a dinner date with her ex-boyfriend James 'Arg' Argent.
However, after their meal, Lydia was forced to confront Arg in a nightclub as she felt he was becoming "too possessive" of her.
The childhood sweethearts split two years ago, after Arg two-timed her, but it is clear he still has feelings for his former girlfriend. Sadly for him, the feeling isn't mutual.
Earlier this week, Lydia spoke out and said she felt like "the nation was against her" when she suspected Arg had cheated with Amy Childs behind her back.
He has since admitted in his autobiography that he did kiss Amy at an ITV Christmas party shortly before he and Lydia split.
Arg was at the Barbie and Ken party last night and the pair were spotted politely kissing on the cheek before having a chat. Only time will tell exactly what they discussed though...
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