Forest sink woeful Chelsea to boost survival bid
Taiwo Awoniyi marked his 100th Forest appearance with the early opener at Stamford Bridge and Igor Jesus's penalty doubled their advantage soon afterwards.
Cole Palmer compounded Chelsea's misery when he missed a penalty late in the first half.
Awoniyi struck again after the interval and Joao Pedro's eye-catching bicycle kick in the closing stages was no consolation for lacklustre Chelsea.
Languishing in ninth place, Chelsea's wretched run has left them on the verge of failing to reach next season's Champions League.