has become the first woman to win two Olympic rhythmic gymnastics all-around gold medals after
she defended her title at London 2012.
The Russian's score of 116.900 saw her finish ahead of silver medal winning compatriot
of Belarus who took bronze.
The 22-year-old performed several breathtaking routines in the Wembley Arena to finish clear of the field.
"You do not have to be Russian to appreciate how brilliant this lady is. She is on her own."
Each of the 10 gymnasts competed with the hoop, ball, clubs and ribbon.
Dmitrieva had upstaged her three-time world championship winning team-mate in the
opening qualifying round on Thursday,
but the usual order was restored in the final.
Kanaeva took a grip of the competition from the first routine as her mastery of her gold-coloured hoop produced a score of 29.350, before she was given a leading 29.200 with the ball.
The clubs provided no obstacle as yet another stellar display was rewarded with 29.450.
Kanaeva's mixture of grace and accuracy ensured Dmitrieva headed into her last routine knowing not even a perfect score would win gold.