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Australian-born Storm, who has been enjoying a low-profile relationship with Boyzone singer Ronan for more than a year, wore a striking red gown.
The model and TV producer teamed the one-shoulder dress with matching lipstick and carried a gold Yves Saint Laurent clutch bag.
Ronan, 36, who annually hosts the fundraising dinner, stood proudly with Storm and his three children, Jack, 14, Missy, 12, and eight-year-old Ali.
The ball raises money for Cancer Research UK and the Marie Keating Foundation, a charity which Ronan founded in honour of his mother Marie, who died of breast cancer in 1998.
This year the evening was co-hosted by Emma Willis and Daybreak presenter Christine Bleakley and held at Old Billingsgate Market in London.
Showing support for their fellow Boyzone bandmate were Keith Duffy and Mikey Graham.
Among the star-studded guest list were Vanessa Feltz, singer Matt Goss, Olympians Gemma Gibbons and Greg Rutherford, ice skating duo Jayne Torvill and Christopher Dean, footballer Alan Shearer and actor Stephen Graham.