Ennis was the favourite for the gold medal going into the first day of competition on Friday morning.
And the Sheffield athlete lived up to all the expectations as she stormed to an emphatic victory in the 800m to claim gold in front of a crowd of 80,000 on Saturday night.
Ennis was in Hyde Park yesterday to show off her medal to the thousands of fans that were watching the action on the big screen.
Speaking to Absolute Radio host Johnny Vaughan if her triumph had sunk in, she said: "No, I'm still in shock. It's been a whirlwind and I'm just blown away by how many people are here.
"I slept with my medal beside me. It was an amazing feeling to wake up this morning and know that it wasn't a dream."
Her gold medal on Saturday night kicked off Great Britain's most successful evening in athletics as Greg Rutherford claimed gold in the long jump before Mo Farah also picked up gold in the 10,000.
Twelve months ago Ennis lost her world title in Daegu but it was a dominant performance from the twenty sixth year old as she ran the fastest time by a heptathlete ever in the hurdles as well as throwing a personal best in the javelin.
There was heart break for Ennis four years ago when she missed the Beijing Olympics due to a serious foot injury.
Ennis had suggested that she may be on the start line for the 100m hurdles but decided yesterday that she would not take part.
FemaleFirst Helen Earnshaw