The 24-year-old has lost a whopping 2st and loves to show off her new look. 'I'm so excited to be back!' she gushes. 'I'm the slimmest I've ever been.'
Charlotte hit our TV screens last week as a judge on Andrew Lloyd Webber's new TV show Over The Rainbow and Gavin's also doing an ITV1 reality show called 71 Degrees North.
The couple are somehow managing to juggle their workload
'We don't have a nanny,' the young mum reveals. 'When I do the new BBC show, either Gav, my parents or his parents have the children.
'But if I ever had to go away I'd take them with me. I love being a mum so much and I've been bowled over by how much the children mean to me.'
Charlotte and Gavin do plan to marry but won't be rushed.
'I don't ever want to feel pushed into a situation,' says the singer. 'We're very happy together. We've been together for five years now and Gavin puts up with all of my mood swings. I was hideous to him when I was pregnant!
'But I'd like to think that we know each other pretty well. I feel I've got a really good one in Gav. He's brilliant. I feel lucky. Life's pretty alright right now.'
Where to next?
- See Charlotte Church's amazing weight loss!
- Celebrity transformations
- Celeb picture quiz