The cavalry has arrivedpublished at 15:31 British Summer Time 3 June 2017
South Wales Police mounted section are all smiles for the crowd in the city centre.
Juventus take on Real Madrid in the Champions League final at 19:45
More than 170,000 visitors are expected in Cardiff on Saturday
Road closures are in place across the city
Motorists are urged to avoid the M4 for the whole of match day as it will be busy
Rhiannon Beacham and Ceri Coleman-Phillips
South Wales Police mounted section are all smiles for the crowd in the city centre.
BBC Wales reporter Kate Morgan tweets
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Rain has arrived in Cardiff Bay and fans are taking shelter wherever they can.
BBC Wales reporter Stephen Fairclough tweets
Are the crowds gathering to see Juventus legend Edgar Davids or the Champions League trophy?
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Thanks to photographer Tyler George for sending us this picture
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Buffon the mascot is attracting the Juventus fans in Cardiff Bay this afternoon.
Cardiff Airport tweets
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More than 170,000 people are expected to descend on Cardiff today for the Champions League final - 70,000 of them have tickets to the game.
About 22,500 are arriving by air to Cardiff, Bristol and Birmingham airports.
And 1,250 coaches will be bringing fans from more than 30 towns and cities across England.
The M4 and all the main roads into Cardiff will be busiest until 20:00 on Saturday and again from 22:00 until 03:00 on Sunday.
Cardiff Central, Cardiff Queen Street and Cardiff Bay railway stations are expected to be exceptionally busy until 04:00 on Sunday.
BBC Wales reporter Max Evans tweets
Fans are still queuing up to get their hands on this little beauty! Well, big beauty.
Fans show off their street skills.
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Ten players have suffered final heartbreak in their hometown - including Londoners Rio Ferdinand and Chris Smalling, Munich-born Philipp Lahm, and Thierry Henry who comes from Les Ulis, Paris.
These five have all lifted the trophy in their hometown.
Real Madrid's Gareth Bale will be hoping to do the same!
Gareth Bale will be hoping to join an exclusive club of Champions League winners to lift the trophy in their hometown when current champions Real Madrid face Juventus in Cardiff. Only five other players in history have done so.
Denbigh brothers Gareth and Rhodri Jones didn't know each other had tickets - now they are sitting seven rows apart!
BBC Wales reporter Natalie Crockett tweets from St Mary Street
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Wales football legend Ian Rush tweets
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Are you a Buffon or a buffoon? Juve got to have a Real knowledge of football to get a perfect 10 with our quiz.
Look who we spotted near the floating pitch in Cardiff Bay - it's former French footballer Marcel Desailly.
The former Manchester United and Wales midfielder told the crowd in Cardiff Bay that his favourite memory was winning the Champions League in 1999.