The couple, who tied the knot in a church in December last year, performed an American Smooth to Michael Buble's 'Can't Help Falling In Love'.
The Strictly star decided to share the romantic video to his fans this week. He told his Twitter followers: "I'm feeling generous after all of this #LIOTR love ....here's mine and @Izzysattic first dance for you guys."
Harry, 27, who arranged for Strictly announcer Alan Dedicoat to record a special greeting, showed off the same effortless dance moves that made him win the coveted Glitterball trophy in 2011.
In the video, Harry and Escala violinist Izzy don't put a foot wrong as they lead in a beautiful choreographed dance routine. As guests gather round to watch the pair in action, Harry and Izzy seem mesmerised by each other.
Of course, as the couple end with a kiss, guests give the husband and wife a rapturous applause.
Harry became the second member of McFly to walk down the aisle after bandmate Tom Fletcher got married to Giovanna Falcone in May last year. Tom already made fans weep when he shared his musical wedding speech on YouTube.
McFly are set to return with a brand new single, 'Love Is On The Radio', to celebrate their 10 year anniversary.
Check out Harry and Izzy's first dance below: