The busy mum-of-two has just listed her second Californian mansion for sale – for $2 million more than she paid for it in 2012. Britney also owns another palatial spread just 6km away that she bought in October 2015 for a measly $9.7 million. That property includes a 13,000-ish-square-foot Italianate mansion with five bedrooms and 7.5 bathrooms,…