Crikey, it's not every day a celebrity airs out their dirty laundry.

(Although, in fact, we're sure this lady's bras are very clean.)

But a certain new mum on the celeb block has done just that.

Christina Aguilera That's right, Christina Aguilera has told Usmagazine.com: "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 keep the tags that prove it, to look back for memory's sake."

The singer, featured in the mag's hot bodies issue, also shared secrets about her diet and weight loss.

She revealed she lost just under three stone in four months.

Wowsers.