Roger Mosey, the Acting Director of BBC Television, tweeted to say that the Duchess of Cambridge has arrived at the Excel Centre where she will present the Sports Personality of the Year and Lifetime Achievement awards.
Martine Wright, who lost her legs in the London bombings on July 7, 2005, and competed in the sitting volleyball at the 2012 Paralympics, won the Helen Rollason Award.
This is presented in memory of the BBC presenter who died in 1999 at the age of 43 after suffering from cancer, and is given for outstanding achievement in the face of adversity.
Wright said: "I am absolutely honoured to be here. I count myself lucky to have survived that awful day, and that I've made an incredible journey, the last seven years."
She thanked the emergency services and medical staff who did so much and added that she "will never forget the 52 people that sadly lost their lives, so this is definitely for them as well."
Josef Craig, Britain's youngest gold medallist of London 2012, scooped the Young Sports Personality of the Year award.
Craig won the S7 400 metres freestyle at the Paralympics at the age of just 15.
Paralympic gold medallist Sarah Storey revealed that she is 13 weeks pregnant today and is expecting a baby on June 23. Storey, who is nominated for Sports Personality of the Year, said it was "an absolute honour" to be shortlisted for the award.
Olympic gold medallist Jessica Ennis told ITV News it was "exciting to be in the top 12" for Sports Personality of the Year.
Bookmakers have revealed a late flurry of bets on Jessica Ennis being crowned BBC Sports Personality of the Year.
Odds on the Olympic heptathlon champion taking the award have fallen from 9/1 to 4/1 in the last 48 hours, betting company William Hill said.
She is now firmly second favourite behind cyclist Bradley Wiggins, who is odds-on to win after his historic triumph in the Tour de France and gold in the Olympics time trial.
William Hill spokesman Rupert Adams said: "There is no doubt that momentum has swung away from Bradley and Jess is steaming up on the outside. The only question is has she left her run too late?"
- Nicola Adams (Olympic boxing gold medallist)
- Ben Ainslie (Olympic sailing gold medallist)
- Jessica Ennis (Olympic heptathlon champion)
- Mo Farah (Olympic gold medallist in the 5,000m and 10,000m)
- Katherine Grainger (Olympic rowing gold medallist)
- Sir Chris Hoy (Olympic track cycling gold medallist)
- Rory McIlroy (World Number One golfer and 2012 PGA Championship winner)
- Andy Murray (US Open winner and Olympic tennis gold medallist)
- Ellie Simmonds (Paralympic swimming gold medallist)
- Sarah Storey (Paralympic cycling gold medallist)
- David Weir (Paralympic wheelchair gold medallist)
- Bradley Wiggins (Tour de France winner and Olympic cycling gold medallist)
Thanks for all the lovely tweets about SPOTY means a lot to be getting all this support now, I've been racing 16 years and glad everyone...
.. has been given the chance to come and watch all us Paralympians doing what we do. Thanks tweeters xxxx
Really looking forward to this evening #SPOTY! Will be an amazing night and will be so nice to catch up with everyone :)
Just landed in London for BBC Sports Personality tonight.. I hope its gonna be a great night...!! Shabba....:-):-):-)