After boasting that her boobs have blasted up to an E cup, it seems Christina Aguilera's post-pregnancy breasts have finally deflated back to their original size.

In a year that has seen the singer's cleavage double in size, the Dirrty star stepped out yesterday for some Christmas shopping in an unbuttoned shirt but for once was not spilling out of it.

Christina in Beverly Hills over the weekend (Splash News, left) and back in November WENN, right)

Christina embraced her new curves after giving birth to son Max in January and was happy to flaunt her eye-popping bosom at every opportunity.

She even paid tribute to her ample assets in interviews, telling one reporter in June, "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!"

So we bid a fond farewell to her E cups