Leah, 24, and fellow candidate Luisa Zissman, 25, were revealed as Lord Alan Sugar's finalists last night (10 July) after they saw off Neil Clough, Jordan Poulton and Francesca MacDuff-Varley in the tough interviews stage.
The entire series - apart from the final - was shot during the winter, so Leah has continued with her job in a busy A&E. But although she's been on TV each week for more than two months, the glamorous blonde has managed to slip under the radar.
Speaking on BBC Breakfast, Leah said: "I'm still working. I look completely different at work. Honestly, no one's recognised me!
"I wear no make-up, my hair's all back and I'm often wearing scrubs. I'm very professional and serious at work and it's been fine so far."
Leah, who is set to go head-to-head with Luisa in the coming days for Wednesday's televised final, counts her profession as being the key to her success.
She added: "I think I am someone who works better under pressure. My background is very serious and high pressure. I do excel in those situations."
Leah appeared on BBC Breakfast alongside Luisa and, after arriving in matching trouser suits, were asked if they had deliberately dressed the same.
Laughing, Leah replied: "I saw her this morning and was like, 'Oh my God, you're wearing my suit!' It was completely accidental!"
Watch the full interview with Leah and Luisa below!