(music-news.com) - The 'Ain't No Other Man' singer and husband Jordan Bratman have been amazed by the impressive growth in her bust, which has swelled to a massive E-cup, since she gave birth to their son Max in January. The 27-year-old singer told Us Weekly magazine: 'It's kind of hilarious! I've never fit into an E-cup before. I look at my husband and go, 'Guess what size this bra is?' And when I tell him, he's just amazed. We have kept the tags that prove it, to look back for memory's sake!' Christina recently revealed she has lost the 40lb she gained during her pregnancy by breastfeeding Max. She said: 'I think they say that when you're breastfeeding, you know, your weight kind of slims down. It's a little easier. It's like a workout within itself. It's very tiring actually and you find yourself snacking more often.'