The model beat competition from Natalie Gumede, Susanna Reid and Sophie Ellis-Bextor to lift the coveted Glitter Ball Trophy on Saturday night's (21 December) live final.
Abbey looked stunned when her name was called out, perhaps because BBC Breakfast host Susanna had been considered the bookies' favourite.
It was the first all-female finale in the history of the show.
Abbey, who was supported by footballer husband Peter Crouch in the audience, said: "I just can't believe this! It's just mad. My daughter is going to be so happy! This (trophy) will be going in her room probably! I'm so shocked."
Peter was seen clapping after his wife's win and, according to BBC, she ran to him for a hug once the show went off air. He arrived midway through the evening's final as he'd been playing a match on Saturday afternoon.
Abbey had been teamed with pro dancer Aljaz Skorjanec in what marked his debut year on the BBC One show.
Saturday night's two-part final started with all four female finalists performing two dances. Susanna earned 37 and 36, Abbey 40 and 38, Natalie 39 and 40, and Sophie 39 and 35. The public vote lines then opened and the second episode of the night opened with Sophie being eliminated.
The 'Murder On The Dancefloor' singer said: "I've had such a ball. I didn't come here to win, I came here to have fun and dance and it's been incredible. I'm really happy."
Her partner Brendan Cole added: "I've had the best series I could ever dream of and she's been the most fun a guy could wish for."
Strictly's second episode opened with Susanna and Kevin Clifton performing their Blackpool paso doble, their favourite dance of the series. At the end of the dance, Susanna remained lying on the dancefloor for a few seconds. She later became tearful while hugging Kevin.
It was a fabulous final performance, earning rave reviews from the judges and 39 points. "If I am dreaming, don't wake me up!" said Len Goodman. "I loved it!"
Abbey and her partner Aljaz were up next with their 'Walking On Sunshine' quickstep.
"Absolutely dazzling in its brilliance," said Bruno Tonioli. "It's up there with the best we've seen." Darcey Bussell called it a "seamless quickstep". Their final score was 38.
Natalie and pro partner Artem Chigvinstev were the last of the finalists to perform, showcasing their American smooth to 'And I'm Telling You'.
"The fluidity and how you mirror each other is just perfection," said Darcey. Len said series eleven of the show had been "absolutely wonderful" and this dance had been a fitting end to the series. The judges scored them a perfect 40.
The final leaderboard for the night was:
Natalie and Artem: 119
Abbey and Aljaz: 116
Susanna and Kevin: 112
Tonight's final also featured a performance of 'Puttin' On The Ritz' by a very dapper looking Robbie Williams, and the eliminated Strictly contestants of the series returning for a final dance.
The full Strictly Come Dancing 2013 lineup in pictures:
Copyright: BBC/Ray Burmiston