In the new annual Hot Bodies issue of Us Weekly, new mom Christina Aguilera shares the diet and workout secrets behind her 40 pounds weight loss

Chritina Aguilera Latest Hairstyles
"It's kind of hilarious! I've never fit into an E-cup before," she tells Us. "I look at my husband and go, 'Guess what size this bra is?' And when I tell him, he's just amazed. We keep the tags that prove it, to look back for memory's sake!"