Defender James Collins scored his first goal for Aston Villa to condemn Barclays Premier League leaders Chelsea to a second successive away defeat following the 2-1 result at Villa Park.
Martin O'Neill's £5million capture from West Ham took advantage of slack marking to head the winner after 52 minutes.
Didier Drogba had given the Blues the lead after 15 minutes but Collins' defensive partner Richard Dunne levelled before the interval.
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