(digitalspy.co.uk) - Christina Aguilera has vowed to lose her baby weight before she releases her fourth album.The singer and her husband Jordan Bratman welcomed the arrival of baby son Max Liron in January.Aguilera is now determined to get in shape for her music comeback, with regular gym and boxing sessions on the agenda."I haven't got back to my pre-baby weight yet, but I'm loving my body," Christina explained. "My husband loves my cleavage in particular. "I've just got back into the gym and I'm doing boxing and weights. I want to be in shape for my next record."