The event is usually attended by the royal family of Monaco, but this year it was only Princess Charlene and twin children Prince Jacques and Princess Gabriella who went to the event as Prince Albert continues to battle COVID-19.
Charlene made sure to keep a close eye on her two children as they held the torches and she guided them as they lit the flames.
The mum-of-two was also snapped putting her arms over her daughter, while Jacques stood close by.
The family unit made sure to wrap up warm for the ceremony, with all three sporting thick coats. Charlene wore grey, while Jacques had a black one and Gabriella styled out a pink one.
The lighting of a fishing boat on the eve of 26 January has been a custom in the country since 1874 as Monegasques honour their patron saint, Devota.
The patron saint of Monaco is said to be a Christian woman who was persecuted for her faith and killed during the Diocletian persecution in Corsica.
Her body was due to be burned, but was rescued by Christians and sent on a fishing boat to Africa, where it was hoped she would receive a Christian burial. The boat encountered a storm and instead travelled to Les Guamates, where a chapel to Saint George already stood.
The National Day is held on 27 January with a mass being held in the Cathedral of Our Lady of the Immaculate Conception, which the royals usually attend.