In the final they beat Hope Winter, from Greenwich, Jolie Stevens, from Cardiff, and Callum Doignie, from Telford.
Liv said: “We are just really grateful, we’ve worked really hard and our families over there, we love them so much. All the coaches – Will, you’ve been so life changing for us, we just feel amazing. Thank you everyone, thank you.”
Will.i.am said Jen & Liv’s relationship reminded him of his friendship with Black Eyed Peas founding member Apl.de.Ap.
He said: “Seeing the girls, they remind me of me and Apl, me and my best friend.
“To see people who really truly appreciate one another and support one another, it just reminds me of the person that I built my dream with, and that’s my best friend.”
The final of the 12th series of The Voice was aired on 30 December on ITV.