The Saturdays singer wore a white shift dress when she arrived at Bells of Shoreditch nightclub to guest DJ at 'We Love Pop' night (July 6).
She accessorised the dress, which had a palm tree pattern and gorgeous cut-away back, with a black clutch handbag and black heeled sandals.
After her guest DJ set, however, Mollie stepped out in a floral Ted Baker two-piece in the early hours of the morning.
Mollie's set in the East London club included some classic pop tracks, from the likes of All Saints.
After the night, Mollie tweeted: "Thank you so much to EVERYONE who came down tonight! What a great crowd!"
Which of Mollie's outfits do you prefer? Tell us below!
Watch the video for The Saturdays' Desperate Housewives-inspired 'Gentleman' below: