Andrea, coached by The Script's Danny O'Donoghue, got a rapturous reception in her hometown of Pomeroy, Co Tyrone.
Andrea and is joined by 23-year-old Leah McFall, from Carnmoney in the final.
Coral bookmakers are confident that Leah "only has to show up" to win the lucrative recording contract, but Leah is trying not to think any further than Saturday night's performance.
Speaking to the Belfast Telegraph last night when she was home to see friends and family, Leah said she has loved every moment of her experience on the hit BBC show.
"I'm just so grateful to have got so far," she said.
"No matter what happens, I feel like I've achieved more than I even set out to achieve.
"I'm going to do my best and see what happens."
Before Leah was whisked back to London for intensive rehearsals, she revealed regardless of the show's outcome it's "very likely" she will record a track with her celebrity mentor will.i.am and that she's off to a top secret destination with him this week.
"All I know is that I need my passport," she said.
Our Leah now has tens of thousands of fans all over the world. She is the first Voice contestant to crack the Top 10, the paparazzi have snapped her and she's even had a fan photograph her sleeping on the London underground.
Leah told the Belfast Telegraph she had been blown away by the response.
"I've been floored by the response and just really humbled about the amount of people who are like 'we want to get behind her and support what she's doing'," she said.
"I never even thought about charting; I hoped to chart after I released my own album, so charting before that literally wasn't in my dreams."
In between rehearsals Leah explained she was recording her own material.
"I'm in the studio at the minute while rehearsing, so I'm knackered," she said.
"I obviously believe in it, it's a mixture of an R&B feel with a lot of new influences in it.
Leah's proud parents – Ruth and John – are thrilled their talented daughter's hard work is paying off.
John said watching Leah shine on stage is a great feeling.
"I feel elation, pride and a wee bit of fear too," he said.
"The last time we were in the audience and the crowd started cheering and yelling and stamping their feet, it got louder and louder, so much so you could feel the vibrations coming up through the floor and I just thought, this is immense, it's for our wee girl."
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