Well, as she reveals that it is nobody from The Bachelor universe, and that Aussie reality TV is incest AF, people have done their research and discovered that it could be none other than controversial Big Brother star Drew Anthony.
You may remember Drew as the hot model that contestant Tully Smith hooked up with in the house - while she had a girlfriend on the outside.
Dun dun dunnn. Look, it made for great TV.
As the Daily Mail points out, the pair have been spotted on numerous occasions together. Most significantly the time that Leah first showed off her engagement ring.
See this photo she uploaded on Instagram...
...it seems to be the same day she was pictured with Drew. Or she could just really like that grey sweater. Who knows?
You can see all the proof here, and if we're being honest we think this could be totally true.
What a wild turn of events.