After she arrived for rehearsals at London's o2 arena in flashing Buffalo trainers, the singer made a quick change into a sparkly black gown.
Naturally, to complete the look, Lily paired her dress with lilac nails, blue eyeshadow and YELLOW dip-dyed hair. Talk about a colour clash...
Lily looked amazing and if you can't do the dazzling red carpet thing at the Brits, when can you?
See who else turned up for the music event of the year below: