Geri donned one of the six designs - a midnight blue asymmetric gown named after the singer - which proved perfect for showing off her tanned skin and blonde locks at the event.
In a contrast with her former bandmate, Geri by Next will be a touch easier on the wallet than Victoria's creations (which include a handbag costing £8,995) with prices starting at £89.
According to Next: "Geri has channelled every clever trick she's learned from years in the fashion spotlight [for the collection]."
The dresses are set to hit stores in October and judging by the liberal use of jewel-coloured satin we suspect Ms Halliwell has the Christmas party market in mind.
How do you rate Geri's eveningwear? Let us know in the comments.