Downton Abbey star Joanne Froggatt should know better than to mix a posh top with black jeans at Karl Lagerfeld's collection launch at Selfridges in London on 24 July.
Get your celebrity gossip alert
Catch up with all the Harry Styles news
Win A Luxury Hamper And A Year's Supply Of Linwoods Superfoods
The latest magazine in the Now Specials Series is full of amazing tips