Pop star Britney Spears says being a mother to her active sons and hitting the dancefloor have both helped her to stay slim. The ‘Womaniser’ singer has two sons, Sean Preston (5) and Jayden James (4), and claims they are part of her training regime. “How do I keep slim? Having two boys definitely helps, and I love to dance. It’s the best way to stay in shape,” she reveals. Despite enjoying time spent with her boys, Britney still cherishes some indulgent escapes when she can find the time. “I love treating myself to a spa day. oassages are my favourite.”