The Belgian participating broadcaster, Flemish Belgische Radio- en Televisieomroep (BRT), selected its entry through a national final.

Nicole and Hugo had won the 1971 national final with the song "Goeiemorgen, morgen", but days before the contest Nicole had fallen ill and was unable to travel to host city Dublin, so Jacques Raymond and Lily Castel had been drafted in as last-minute replacements.

The final took place on 25 February 1973, held in the Amerikaans Theater in Brussels and hosted by Jan Theys, with five acts performing two songs apiece.

[1] On the night of the final Nicole and Hugo performed second in the running order, following Finland and preceding Portugal.

Several clips from the performance were shown during Eurovision's 50th anniversary TV gala Congratulations in 2005, culminating in a live appearance by the pair, wearing their infamous purple 1973 outfits and performing an abridged version of the song.