Keogh scored Derby's second own goal
The centre-back added to the previous own goal of his partner Fikayo Tomori.
In a crazy start to the fourth round clash Richard Keogh diverted Davide Zappacosta's cross past Scott Carson, giving Chelsea a 2-1 lead.
However on Frank Lampard's return to Stamford Bridge, his team showed fantastic spirit to come back again against the Premier League giants.
Mason Mount got in behind his parent club's sloppy defence, coming back to haunt Chelsea as he crossed for Martin Waghorn to level the scores.
Cesc Fabregas then added a third goal for Chelsea, the first one scored by one of their players