This evening's live semi-final will see the eight remaining acts singing twice for a spot in the final.
Each of the contestants will perform solo before hitting the stage again with their coach and team mates for a group number.
Speaking to us about her latest solo song, Lydia teased this week: "Well, I can’t say too much obviously but let’s just say, it’s probably going to be the most poignant performance to date!"
But the real highlight for Lydia will be sharing the spotlight with Will.i.am.
And after his crazy performances on The Voice UK over the past five years, we can't even begin to imagine what he's got planned.
"I am SOOO excited to be performing with Will," Lydia told us. "He’s such an amazing person, it’s like a dream come true to me - I cannot wait!"
Chatting about working with the Black Eyed Peas star in the run up to the semi-final, Lydia added: "He’s so nice and makes me laugh so much and his advice and mentoring has been incredible so far."
Meanwhile, talking this time to the Daily Mirror, Lydia compared Will.i.am to Willy Wonka.
"He takes all these ideas and muddles them and it always seems to work," she said.
The Voice 2016 live semi finals air tonight on BBC One at 7PM.