Sparking the mystery was Debbie, who tweeted: "Wishing my Lydia all the best today. One of the most memorable days of your life #goodluck #deepbreaths."
And then Lydia confused us all even further by posting an image of herself to Instagram with the caption: "After a slightly stressful morning I am finally in my car. Literally the most exciting but nerve wracking day ever! This is my excited/scared face. Watch this space. All will be revealed on Monday."
Ahh! We can't wait that long!
Sister Georgia then tweeted: "Good luck Lydia, very proud sister!"
We've reached out to Lydia's reps to see if we can get any sneaky early clues about what exactly is happening – because it sounds pretty big / exciting, right?
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