The 37-year-old was over the moon when she won the prize at last week's ceremony, but admitted that she found it difficult to articulate herself after hearing the good news.
'I have to say I was not expecting to win and I was quite overwhelmed,” she told Hello! magazine.
'I've never felt my heart beating so fast. I lost the ability to think or speak – my vocabulary just went out the window. It means so much to me.
'I had the most phenomenal team of people and I was up there on behalf of all of us and I really didn't want to forget anyone. My mind was completely blank.'
The mum-of-four also revealed that her children inspire her “every day”, and that her husband David is her “rock”.
“David is my rock,” she told the UK magazine. “He encourages me and gives me the confidence to do what I do and my kids inspire me every day.
“And my mum and dad were here, which was fantastic. I love them all so, so much. My family means everything to me.'