Only two acts will be sent through to tomorrow’s grand final following a public vote.
Tonight the judging panel will select one act as a wildcard to also perform tomorrow, which will be announced during the show.
There will be performances from choir Pitch Perfect Creation, dancers Code 3, singer Jamie Lee Harrison, Lords of Strut, Jess Robinson, the Missing People Choir, TNG Characters, Amanda Holden’s Golden Buzzer Daliso Chaponda.
The two most popular acts and the wildcard will be joining the other finalists: MerseyGirls, The Pensionalities, Kyle Tomlinson, mind reading act DNA, magician Matt Edwards, Issy Simpson, Tokio Myers and comedian Ned Woodman.
Although it is not know who the wildcard will be, teen singer and Simon Cowell’s Golden Buzzer Sarah Ikumu could be brought after her shock elimination earlier this week.
Alesha Dixon has already hinted that the Missing People Choir could be the winners of this year's competition.
The 38-year-old ITV judge exclusively opened up to Express.co.uk about the emotional moment when the charity choir first performed, saying: "I was really proud to be a part of the show when that aired.
"I just thought, 'this is how you use your platform responsibly'," she continued.
"It was such an important message, it was so beautifully done and I think everyone watching had empathy for them and compassion for them and respected them and admired them."
We will be following all the action from the fifth semi-final show.
See below for all the live updates from tonight’s Britain's Got Talent semi-final on ITV.
Britain's Got Talent: Most memorable moments Mon, May 1, 2017
Britain's Got Talent: The best and worst moments from the ITV talent show.
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Dance act Just Us get the golden buzzer
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9.45pm The tension is mounting as we wait for the results!
9.42pm Daliso Chaponda is hoping that he can be the first comedian to win the show, saying that by the law of averages it's his turn.
9.3opm We're back!
Jamie Lee Harrison from Newcastle sang a Kelly Clarkson track on the show
9pm The votes are now open! Join us after Coronation Street for the results.
8.56pm "It's stupidly good," says Simon to the two of them – that's a compliment.
"You are the new Jedward of dance, if that's possible," Alesha tells them, saying what everyone across the nation were thinking.
8.55pm The Lords of Stut give another bonkers performance with their comedy dancing. It's an Eighties nostalgia fest and the brothers from Ireland look like they are having a great time as they get the crowds going.
Creepy dancer TNG Characters left the judges scared
8.48pm David Walliams has just insulted the whole of Newcastle as he tells the singer that he proves "talent does come from Newcastle".
8.45pm "Absolutely wonderful. You broke my heart," Amanda says.
8.43pm The second-to-last act of the evening is Jamie Lee Harrison from Newcastle, giving a rendition of Kelly Clarkson's Piece by Piece. It's a rousing, big performance from the young singer.
8.33pm "That was scary. I was scared before you started," says Alesha as she praises them from being "different and memorable".
"It's different. I like being scared in that way – a little bit. This is one of the best dance groups on the show," Simon explains as he looks spooked.
8.31pm The scariest act in the competition: TNG characters. Can their frightening performance help to secure a place in the final?
The Missing People Choir perform on Britain's Got Talent
8.22pm "It just hits you. You are turning these incredibly sad stories into stories of hope. I am sure everyone across the nation is going through the same emotions as we are," David tells them as his voice sounds like it's close to breaking.
Alesha, too, is also fighting back tears as she is ovecome with emotion as she pours heaps of praise on them.
8.20pm It is absolutely heartbreaking and beautiful at the same time, perhaps the emotional performance of this evening.
8.18pm The Missing Choir are one of the big favourites this year, consisting of 30 members who have lost loved ones.
The choir is trying to spread its message and help to find their missing friends and relatives. Prepare for goosebumps.
Amanda Holden’s Golden Buzzer Daliso Chaponda will be hoping to go through to the final
8.14pm "I think that is even better than the first time we saw you. You were so on the edge, it was naughty, it was edgy. You smashed it," Amanda praises him.
"I love that you are fantastically non-PC," Simon adds as he wants him to get his own show.
Daliso used to tour with Jack Whitehall, who says the stand-up has never been given his break but David vows that Britain's Got Talent will be his big break.
8.08pm Next up is Malawian comedian Daliso Chaponda, who is hoping to win the whole competition and "score the knockout punch". Judging by the look on the judges' faces, they are enjoying it.
8.06pm Simon is somewhat disappointed and wanted more, saying: "At this stage in the competition, I want more." However, David, Amanda and Alesha disagree with him as they praise the trio.
8.04pm The staging in certainly something else this evening with a Beyonce medley.
8pm Code 3 from Dartford are hoping they have what it takes to go through to the final. They say they want to win it and represent female dancers.
The Missing People Choir perform on Britain's Got Talent
7.58pm Up next will be Code 3, Daliso Chaponda and the Missing People Choir.
7.55pm "That was fantastic, you looked like you were having the time of your lives up there. Joyful, well done!" says Alesha.
"The song was good but it was you that made it," Simon tells them as he gives them a thumbs up.
7.51pm Prepare for your heart to be melted by the first choir of the evening: Perfect Pitch Creation, who consist of 41 children and want to be the first choir to win Britain's Got Talent. They've gone for another Disney classic: Friend Like Me from Aladdin.
Impressionist and singer Jess Robinson performs on Britain's Got Talent
7.42pm It's an ecclectic medley of songs and voices.
"I loved that, I was laughng through out. The material was really strong too. I loved you having a little go at our Alesha. You've started this show on a really high level?" David Walliams says. While Alesha asks Britain to pick up their phones for Jess.
7.38pm Impressionist Jess Robinson is first up – let's hope she makes them laugh again. She dedicated her performance to her grandfather.
7.36pm The judges appear and it looks like Amanda has decided to take the plunge again. Last night's dess attracted over 200 complaints but the judge has opted for a simiilar style again.
7.33pm One last time… here are the final eight acts competing in the last semi-finals of Britain's Got Talent.
Britain’s Got Talent airs on ITV tonight at 7.30pm.