Emma Willis has taken a trip down memory lane, reflecting on the moment she co-presented the 2017 BRIT Awards alongside Dermot O'Leary.On the four-year anniversary of the exciting career highlight on Monday, the TV presenter shared a series of behind-the-scenes photos - including one featuring both her sisters, Sharon and Rebecca Griffiths.MORE: Emma Willis professes love for husband Matt in hilarious selfieWATCH: Emma and Matt Willis unveil major home change"Post-show with my sisters," she