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Chris and Dianne are performing their Show Dance to You Get What You Give by New Radicals.

Positive comments from all of the judges - but let's see if the scores are just as great:

Craig: 10

Motsi: 10

Shirley: 10

Anton: 10

Combined with the scores of Tasha and Aljaž's first performance tonight, their total points this evening come to 79 out of 80 possible points so far.

After receiving the perfect score, Tasha thanked her family before receiving a surprise...

Tasha and Aljaž have just receieved some rave reviews for their Show Dance.

Craig Revel Horwood says it was "Broadway ready" and that he "totally loved it".

Motsi Mabuse says it's like nothing they've ever seen on Strictly, witnessing Anton Du Beke's jaw on the floor.

While Head Judge Shirley Ballas called the performance "magical".

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It’s time for Tasha and Aljaž’s new dance for tonight.

They’re performing a Show Dance to Benny Goodman’s Sing, Sing, Sing.

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Love Island star Tasha Ghouri has been the one to beat this season.

Along with her partner Aljaž Škorjanec, they have scored 22 perfect 10s. Despite topping the leader board six times, and getting a maximum 40 score last week, Tasha was in the dance-off for the second time in the semis.

She says it has always been her dream to appear on Strictly and represent the deaf community.

Head judge Shirley Ballas said she has “the most spectacular leg actions she has ever seen on this show”, while Craig Revel Horwood described her first performance as “Slay, slay, slay”.

The scores for JB Gill's Show Dance are in.

Craig: 9

Motsi:10

Shirley: 10

Anton: 10

So, combined with his first dance, he has a total of 79 out of a possible 80 points.

A fun and colourful routine from JB and Lauren in their orange suits, with the audience cheering and clapping throughout.

"Thank you for bringing the party to Strictly Come Dancing," judge Motsi says.

Judge Shirley also praises the performance, saying: "If you ever wished for the night of your life, that was it."

Noor Nanji
BBC News Culture reporter

There’s always one…

As Sarah Hadland and Vito Coppola finished their dance a few minutes ago, Vito seemed to be struggling with his trousers.

“Are you OK Vito?”, host Tess asked him. “We have a wardrobe emergency! Are you able to maintain your decency?”

Head judge Shirley Ballas picked up on that point. “Well there might be a malfunction with the trousers but no malfunction with the routine”.

Phew for that!

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It's time for JLS star JB Gill and his partner Lauren Oakley, who are dancing a Show Dance to a Motown Medley.

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It’s been a rocky ride for former JLS member JB Gill, as the first contestant in Strictly history to switch partners during the competition.

But any sense of chaos hasn’t been reflected by his scores.

JB scored 39 for his first dance with professional Lauren Oakley after his original partner, Amy Dowden, pulled out of the competition with a foot injury.

Last week his salsa secured his first 40, having scored 39 in week seven's Couple's Choice, week 10's Charleston and week 11's Viennese Waltz.

And he’s no stranger to success - JB won the Strictly Christmas Special in 2012.

Claudia Winkleman has just announced that voting has now opened, so you can cast a vote for your favourites.

We have a recap of the first four dances from the finalists in the post below.

All four finalists have performed their first dances of the night.

Here's a recap of how they did:

For JB, he scored a perfect 40/40 after his Viennese Waltz to Let's Go Fly a Kite from Mary Poppins.

Tasha received an almost perfect 39 for her Couple's Choice dance that P!nk's What About Us.Chris scored 38 for his Couple's Choice dance to Instant Karma! (We All Shine On) by John Lennon. The score is five points higher than his original score of 33.

Sarah danced an American Smooth to Proud by Heather Small, and received a score of 39, despite a small wardrobe malfunction for her dance partner Vito.

Praise all-round from the judges - let's see how they scored Sarah and Vito's performance:

Craig: 9

Motsi: 10

Shirley: 10

Anton: 10

That gives the duo 39/40, a stark improvement from the last time they did this dance, scoring 33.

After a slight wardrobe malfunction for Vito, it's time for the judges comments.

Anton Du Beke says Sarah is "captivating to watch" and "clean as a whistle".

Craig says there was a bit of gapping, but the lifts were "spec-tac-ular darling".

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They last performed this dance in week eight, scoring 33 out of a possible 40. She's dancing to Proud by Heather Small.

Despite only missing out on seven points, this is one of Sarah’s lower scores - could this be a chance for her to show the judges how much she’s improved?

Even before he made the final, Strictly contender Chris McCausland told the BBC many people's views of disabilities are "antiquated".

The comedian told Radio 4's Today programme last month that his participation on the show is "extreme", but hopes it will "go some way in stretching people's ideas of what is possible for a person with disabilities".

"I think there are low expectations of people with disabilities - sometimes you’ll come down a set of steps into a taxi and people say 'wow, how did you do that?'”.

During McCausland's week eight dance, he placed his hands over partner Dianne Buswell's eyes as the room faded to black.

The lights came back up moments later to show him spinning Buswell around on his shoulders. The judges praised McCausland for his "poignant" dance that reflected the experience of blindness.

"I pitched this idea to Dianne to have a moment of darkness instead of something that was a gimmick," McCausland said.

"I actually wanted to put the audience in the dark so it was a complete surprise for them to see me spinning Dianne when the lights came on."

Time for Chris and Dianne's first set of scores.

Craig: 8

Motsi: 10

Shirley: 10

Anton: 10

Giving him a total of 38, slightly below Tasha and JB's first scores.

A rhythmic performance from Chris doing his dance that imitates his experience with blindness - a dance that hit headlines when he performed it earlier in the competition.

Judge Motsi says to Chris that she's "a mess, and that's because of you", referring to tears on her face.

"You have a musicality that is so extraordinary like we've never seen on Strictly... I can't remember anyone who had a sense of musicality like you," judge Anton says.

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Chris McCausland and his partner Dianne Buswell are performing their first dance of the night, another go at their Couple’s Choice.

They’re dancing to Instant Karma! (We All Shine On) by John Lennon, which they scored 33 for in week eight.

We've just heard the judges comments on Tasha and Aljaž performance, but now it's time to translate them into numbers - time for their scores:

Craig: 9

Motsi: 10

Shirley: 10

Anton: 10

That gives Tasha a grand total of 39/40, which is the same score she got the last time she performed the dance.