Chelsea were beaten in an action-packed London derby at Stamford Bridge and you can watch all the goals in the video above.
Timo Werner and Cesar Azpilicueta notched for the hosts but the Gunners bagged a brace in both halves to claim the Premier League points.
The result leaves us five points clear of our two north London rivals with a game in hand. You can also watch boss Thomas Tuchel's assessment of the defeat below...