Italy's Måneskin is this year's winner with their song Zittie e Buoni.
The UK's James Newman has come last with zero points with his dance track Embers.
France came second, with Switzerland third, Iceland fourth and Ukraine fifth.
The show followed a Covid-19 protocol, with an audience of 3,500 - about 20% of the arena’s capacity.
It was one of the most high profile live events to take place in the pandemic so far.
Image source, Getty ImagesThis is one of the favourites and it’s easy to see why. It’s got more girl power than the Spice Girls with a great soulful vocal. It’s no surprise that Lizzo, Beyonce and Aretha Franklin are among Destiny's idols. She also appeared on Britain’s Got Talent in 2017, making it through to the semi-finals.
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Image source, Getty ImagesDon’t rule this one out – the staging is classic Eurovision. Manizhe whizzes across the stage ensconced in a ma-hoo-sive traditional costume which she then steps out of it in a red jumpsuit. Freed of her shackles, she belts out a feminist rap anthem with a bit of folk thrown in for good measure. “Every Russian woman needs to know you are strong enough, don’t be afraid. Are you ready for change? We are the change.”
Steve Holden
Music reporter, BBC Newsbeat
Before each act turns up on stage, you might notice the artists popping up in glowing houses.
These are the "postcards" - the long-standing tradition at Eurovision. They're used as a visual cover to get one act off the stage and another one on.
The idea of the "tiny houses" this year was to place each country's artist somewhere in the Netherlands (virtually), surrounded by some of their favourite things.
James Newman loves camping so he's got camping boots, a stove and fried eggs in his.
There's a replica of the house in the press centre filled with some of the ornaments, including Iceland's mugs and Lithuania's hand moulds.
Do feel free to join us tonight - send us images of your Eurovision celebrations (following the Covid-19 rules of course)!, external Our email address is entertainment.news@bbc.co.uk.
Steve Holden
Music reporter, BBC Newsbeat
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The group, singing The Wrong Place, have a collective age of 150. They have been in existence as a group for 25 years although the line up has changed several times.
Anna Holligan
BBC News Hague correspondent
Image source, Getty ImagesMoldova's Natalia Gordienko is singing for her three-year-old son
Backstage, with seconds to go, the artists are hyped.
Stefania, cloaked in a Greek flag, told us she "loves you guys".
As FloRida strutted towards the stage door, he told me he was "excited, super excited", even for a world-renowned rapper, Eurovision with its audience of 180 million around the world, is A Big Deal.
Moldova's Natalia Gordienko told the BBC she had been dreaming of performing on the Eurovision stage since she was a teenager, and was doing it for her three-year-old son.
Conscious they have three minutes to give a potentially life-changing performance, the artists lined up for one final photo shoot outside the stage door, bursting with energy, teasing and encouraging each other with the type of camaraderie unusual for competitors.
In so many senses, this year's competition, taking place in the context of the pandemic, has succeeded in bringing people together in a way, that until very recently, felt impossible.
Image source, Getty ImagesEden Alene won X Factor Israel in 2018 so she’s no stranger to the spotlight. Watch out for a classic Eurovision costume change in this one – dare we say inspired by Bucks Fizz? Here’s a nice little factoid for you – this song contains the highest note (B6) ever sung at Eurovision. Fingers crossed she hits it!
Image source, Getty ImagesBetter known to her 13 million subscribers as NikkieTutorials, beauty YouTuber Nikkie de Jager is hosting this year's Eurovision Song Contest.
She's making history as the first transgender host of the competition.
The 27-year-old recently told Radio 1 Newsbeat she's reflecting the colours of the trans pride flag (white, pink and blue) through her outfits on stage. Read more here.
Image source, Getty ImagesOMG, Anxhela Peristeri is wearing the flesh-coloured shiny tights I wore clubbing in Leeds in the 90s (Back to Basics anyone?) The wind machine is going full pelt and unlike most contestants tonight, she’s taken to the stage solo to perform her song Karma – and she owns that vast space! Bit of a slow burner this one. Unfortunately, it’s in the dreaded second spot. No-one has ever won Eurovision after performing second.
Image source, gFirst up, no pressure.
Now this one’s been a bit controversial. Elena Tsagrinou’ s El Diablo (The Devil) has upset some members of the Orthodox Church in her home country, who feel it’s blasphemous.
Elena says it’s about an abusive relationship. Regardless, it’s a cracking pop track but it’s really reminding us of Lady Gaga’s Bad Romance. Is it just us?
Image source, Getty ImagesJust a little recap for you – there were 39 entrants this year but following the two semi-finals earlier this week, that’s been whittled down to 20 acts plus the Netherlands (who automatically qualify having won it last time round) and the so-called Big Five - the United Kingdom, Spain, Germany, France and Italy.
Those lucky countries get automatic entry to the grand final. So that’s 26 countries in total tonight – hold on to your hats!
Here's the running order:
Eurovision final running order
1. Cyprus / Elena Tsagrinou - El Diablo
2. Albania / Anxhela Peristeri - Karma
3. Israel / Eden Alene - Set Me Free
4. Belgium / Hooverphonic - The Wrong Place
5. Russia / Manizha - Russian Woman
6. Malta / Destiny - Je Me Casse
7. Portugal / The Black Mamba - Love Is On My Side
8. Serbia / Hurricane - Loco Loco
9. United Kingdom / James Newman - Embers
10. Greece / Stefania - Last Dance
11. Switzerland / Gjon's Tears - Tout l'Univers
12. Iceland / Daði og Gagnamagnið - 10 Years
13. Spain / Blas Cantó - Voy A Querdarme
14. Moldova / Natalia Gordienko - Sugar
15. Germany / Jendrik - I Don't Feel Hate
16. Finland / Blind Channel - Dark Side
17. Bulgaria / Victoria - Growing Up is Getting Old
18. Lithuania / The Roop - Discoteque
19. Ukraine / Go_A - Shum
20. France / Barbara Pravi - Voilà
21. Azerbaijan / Efendi - Mata Hari
22. Norway / TIX - Fallen Angel
23. The Netherlands / Jeangu Macrooy - Birth of a New Age
24. Italy / Måneskin - Zitti E Buoni
25. Sweden / Tusse - Voices
26. San Marino / Senhit - Adrenalina
BBC Radio 2 has been celebrating Eurovision 2021 all week, building up to tonight's live grand final,hosted by Ken Bruce.
Ken is live from Wogan House in London from 8pm – his first time broadcasting from there since March 2020.
Graham Norton is guiding us through the contest on BBC One, he's said it's an "emotional night" and has "apologised if I start blubbing". Don't worry Graham, you can always have one of our tissues, sniff.
Steve Holden
Music reporter, BBC Newsbeat
Usually, the press centre at Eurovision is packed with hundreds of people from across the continent who drape their desks with flags and mascots.
This year, only 500 journalists are allowed on site and the set up is very different from previous years.
Desks have to be assigned, there's no mingling between journalists of different countries and things are a lot quieter. If anyone is spotted sitting too close to someone, one of the Eurovision volunteers soon comes over to tell you to stay apart.
Interviews with artists are strictly controlled in designated areas and it's much harder to be spontaneous.
Image source, Getty ImagesMost of the acts have been in Rotterdam rehearsing for more than a week and have been following strict guidelines to avoid a Covid outbreak.
Countries are in so-called delegation bubbles and aren't allowed to mix with anyone outside them.
James told the BBC earlier this week that he’s being really careful so sadly hadn’t seen much of Rotterdam.
“From what I can see from my hotel window, it looks amazing!”
There's going to be fireworks...
“We’re going to have pyrotechnics, I’m excited... hopefully I won’t burn my leather jacket!”
Steve Holden
Music reporter, BBC Newsbeat
Image source, Getty ImagesEurovision allows a maximum of six people on stage for every performance. So here's the breakdown on how many people the countries have in vision for the viewers on stage.
One - Albania, France, Switzerland, Spain, Bulgaria.
Two - NO COUNTRIES.
Three - Serbia.
Four - Italy, The Netherlands.
Five - Cyprus, Belgium, Russia, Portugal, United Kingdom, Greece, Moldova, Germany, Lithuania [pictured], Azerbaijan, Norway, Sweden, Malta.
Six - Israel, Iceland, Finland, Ukraine, San Marino.
Italy is currently looking like the odds-on favourite to win tonight's prize, with France and Malta just behind - but all this could change of course, Eurovision is known for its surprise winners.
The UK's James Newman is currently rated as number 20 in the list of favourites, out of the 26 entries. Watch this space!
Happy Eurovision 2021!
Image source, Getty ImagesThe big day is finally with us, and we're counting down the final minutes until the song contest can launch from Rotterdam's Ahoy stadium.
After waiting two whole years for Eurovision, fans around the world can let loose and enjoy the show wherever they are.
This year's glittering event is following strict Covid guidelines, as are we - our party snacks are all individually wrapped.
Stay tuned for all the latest, as well as behind-the-scenes news from the press room.