The 40-year-old former X Factor judge wore a floor-length midnight blue sequinned gown as she posed with the line Project D's co-designer Tabitha Somerset Webb.
Moments later the star caught her heel in her gown and fell on the steps, before receiving a helping hand from a fellow guest.
Minogue is currently planning a return to British TV and appeared on Lorraine yesterday, saying: "I would love to be back on TV here.
"I'd love to come back and do something new. I think the landscape of TV has changed incredibly in the last 12 months globally, so it's kind of like what is going to happen next and you want to do something that's going to be really good, and you're passionate about."
The Aussie star has been residing in Melbourne where she shares custody of her son Ethan with ex Kris Smith.
It was recently reported that Simon Cowell had asked Minogue to make a comeback on The X Factor.