England Women 2020 - Credit C INPHO/Laszlo Geczo
Before the competition was stopped due to the coronavirus pandemic England won their opening four games.
That run included a sensational 19-13 victory over France at the Stade du Hameau. Tries from Abby Dow, Vicky Fleetwood and Emily Scarratt helped them to four points in Pau.
They followed that up with a bonus-point win in blizzard-like conditions over Scotland at Murrayfield, with further victories over Ireland and Wales putting the Red Roses in pole position for the title.
But the pandemic meant a near eight-month break in the competition.
Red Roses head coach Simon Middleton said: “We are delighted to have retained the title after four big performances from the team to date.
"It's a fitting reward for all the hard work put in earlier this year.
“We have a big week ahead and the aim is to stay focussed on securing the Grand Slam in Italy next weekend.”
Middleton will announce his squad for the Italy game later this week.