The couple were snapped leaving a photographic exhibition of singer George Michael, which was held at Hamiltons Gallery in Mayfair.
Clutching onto model Storm's hand, Ronan smiled as he led his lady towards a waiting cab before they headed home together.
Looking stylish as always, Storm showed off her catwalk pins in a pair of tight black leather trousers, teamed with simple courts and a fuzzy coat.
Boyzone star Ronan, meanwhile, looked dapper in a black suit and white shirt.
On Monday (3 March), Ronan turned 37 and he had previously celebrated his birthday with Storm on the weekend.
The Irish singer Instagrammed a cute picture of himself kissing Storm on the cheek, saying: "Now that's a lucky boy. Birthday kisses from @StormUechtritz even if I did have to steal them ha."
Ronan and Storm have been dating since September 2012.
Watch Boyzone's video for 'Love Will Save The Day' here: