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The Capital Late Show with Marvin Humes 10pm - 1am
The singer modelled vintage creations at the launch of Lucy In Disguise at Harvey Nichols.
The 'Smile' singer was joined by a host of celebrities at a seaside-themed vintage party at the London department store.
Wearing a shimmering green dress, Lily posed next to carousel horses and sipped margaritas.
The bride-to-be showed no signs of the stress of planning her June wedding. Last week she hinted on Twitter that she was tempted to run off to Gretna Green instead, due to the pressures from members of her wedding party.