Tonight’s episode will see the last batch of hopefuls perform for judges Simon Cox, Amanda Holden, David Walliams and Alesha Dixon.
It seems that the excitement of the final auditions is too much for David to handle – so much so that he drops his trousers during one contestant’s performance.
The comedian flashes his underwear during Sue Moretta’s rendition of Don’t Rain On My Parade, drawing wolf-whistles from the audience.
Simon covers his eyes and mutters: “I literally can’t get this thought out of my mind, what I just saw.”
Elsewhere, Audley Buckle, 68, wins over the crowd with his original song Chicken and Chips, and magician Neil Henry shows off his spaghetti-influenced street magic.
At the end tonight’s instalment, the judges whittle the acts down to the final 40 ahead of next week’s semi-finals.
Britain's Got Talent judges David Walliams, Alesha Dixon, Simon Cowell and Amanda Holden
What time is Britain’s Got Talent on tonight?
The final round of auditions airs tonight on ITV from 8pm until 9.20pm.
When do the Britain’s Got Talent live finals start?
The first semi-final takes place on Monday from 7.30pm until 9pm on ITV, followed by a half-hour results show from 9.30pm.
The remaining acts will take to the stage at the same time each night this week, with the grand final taking place on Saturday from 7.30pm until 10pm.
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The Missing People Choir is the favourite to Britain's Got Talent 2017
Who will win Britain’s Got Talent 2017?
This year’s series has been dominated by singers and groups, so it comes as no surprise that many of the frontrunners are musicians.
The Missing People Choir failed to get a Golden Buzzer, but are the favourites to win the competition with odds of 15/8 at Betfair.
The charity choir was among the first to audition, and had the judges in tears with its heartfelt version of I Miss You.
They face competition from 16-year-old Sarah Ikumu, who was put straight through to the semi-finals by Simon after her powerful rendition of the Dreamgirls classic And I Am Telling You, and is the second favourite with 3/1 odds.
Another young singer, Leah Barniville, has been given 5/1 odds, while The Pensionaires, a musical duo with a combined age of 159, have been given 8/1 odds,
Contortionist duo Angara Contorton has been given 9/1 odds, the same chances that Welsh schoolgirl choir Angelicus Celtis has been given.
Eight-year-old magician Issy Simpson and pianist Tokio Myers have both been given 10/1 odds to win.
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Dance act Just Us get the golden buzzer
Britain’s Got Talent 2017 winner odds in full from Betfair
Missing People Choir 15/8
Sarah Ikumu 3/1
Leah Barniville 5/1
The Pensionaires 8/1
Angara Contorton 9/1
Angelicus Celtis 9/1
Issy Simpson 10/1
Tokio Myers 10/1
Kyle Tomlinson 10/1
Goa Lin & Xiu Lin
Sarah Ikumu is second favourite to win Britain's Got Talent 2017
Destiny Chukunyere 12/1
Harry Gardner 14/1
Matt Edwards 14/1
Daliso Chaponda 16/1
Jess Robinson 20/1
Reuben Gray 20/1
Jonny Awsum 20/1
Just Us 20/1
The Miss Treats 20/1
Josephine Lee 20/1