The actress and mother-of-two - who also confirmed she is back together with former Hollyoaks star Jamie Lomas - said it was a "real honour" to win the Bounty Celebrity Mum Of The Year 2009 Award, which was voted for by the public.
Kym - who had to cope with the death of the couple's premature baby boy earlier this year - said: "Yes we are back together, Jamie has got a son of his own and he is a very good father but he can't win Celebrity Mum Of The Year!"
The actress, who is mum to David, 14, and Emily, 11, went on: "It is a real honour to get this award. It is nice to know I have got a lot of support out there, it has been a really difficult year.
"I have been a single parent in the past and I have had struggles so hopefully people still think I have done the best by my children."
Kym, 33, who plays barmaid Michelle Connor in the ITV1 soap, is divorced from former EastEnders star Jack Ryder and split up with Jamie last month, only for them to reconcile.
Her two children are from a previous relationship.
The actress, who beat her former Hear'Say bandmates Myleene Klass and Suzanne Shaw to the crown, added: "It is so important to have a big family network. My parents are so supportive and their dad is very involved in our children's upbringing."
Other mums who lost out to Kym include Holly Willoughby, Natasha Kaplinsky and former winner Katie Price.