Jim, who won the show last year, treated Ollie to a birthday meal at London's Langan's Brasserie on Thursday afternoon (20 March).
Former Made In Chelsea star Ollie posted a collage of photos to Twitter showing the trio enjoying a rather lush dining experience with plenty of champagne.
Ollie even had a candle presented in a chocolate cake as he toasted to another year - we wonder what he wished for?!
The celebrations were far from over though, as Ollie and Casey partied the night away together.
Taking to Twitter, Ollie said: "Thank you so much @JimDOfficial for my fabulous birthday lunch... Still on the champagne with @CaseyBatchelor Xx."
Casey also updated fans on Twitter, explaining that they were on their seventh glass! She said: "@ollielocke Ohhhhh yessss we are! Glass number 7 of champagne and counting! Drinking through the day is lots of fun!"
Ollie and Casey, who have remained close friends since leaving the house, also went out partying the night before (19 March).
The night was certainly eventful as glamour model Casey posed on the bonnet of Ollie's Union Jack themed Jaguar with her heels on! We hope she didn't scratch the bodywork!
Captioning the photo, she said: "Well I forgot about this last night! Standing on @ollielocke Jaguar! #DrunkTimes #BirthdayCelebrations."
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