The lovebirds embraced the show's Christmas-themed fancy dress party, which will be shown during tonight's episode.
Referencing Chronicles of Narnia character Mr. Tumnus, newbie Josh said: "Little preview of tonight's episode. I'm Mr Tumnus apparently... with @officialstephpratt."
Stephanie and Josh's romance has been going from strength to strength, and earlier this month, Stephanie publicly declared her love for Josh at the show's wrap party.
It looks like things are pretty serious between the pair too, as Binky Felstead revealed in last week's episode that the couple are planning to move in together, however, it didn't come as welcome news for Steph's ex Stevie Johnson.
Elsewhere, in tonight's episode, Spencer Matthews faces claims that he tried to pursue former flame Lucy Watson, despite being in a new relationship with girlfriend Lauren Frazer Hutton.
After hearing the rumours, Lauren confronts Spencer at the party, but he denies any wrongdoing and claims it is a "total fabrication".
Having spent the past two weeks defending her relationship with Spencer, what will Lauren decide? The drama continues in tonight's series finale of MIC at 9pm on E4.
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Watch MIC's series finale trailer below: