With Jennifer Lopez's belly expanding faster than a Jiffy Pop factory on fire, burblings are growing louder that she may have two Marc Anthony-spawned buns baking in her oven.

Marc Anthony and Jennifer Lopez announce Lopez's pregnancy onstage in Miami on Nov. 7.

On the heels of People's report last week that J.Lo was recently seen "shopping for two" and a recent OK! item that she's "over the moon" about a double delivery comes a more detailed intrauterine dispatch from E!'s Marc Malkin, who hears she's "definitely" expecting twins -- a boy and a girl.

Lopez confirmed her bulgingly obvious great expectations during her final tour stop with Anthony on Wednesday night in Miami, telling the crowd, "Marc and I are expecting."

The less-than-earth-shattering announcement garnered many screams from the excited crowd and a kiss on the stomach from her beaming hubby.

So, why did Jen wait so long to make the blatant baby news official?

She told the crowd she didn't want to "burden" fans, who would perhaps worry about her high-energy dance moves during the show (you'll recall that she stumbled and nearly face-planted onstage last month).

Christina Aguilera is spotted in Beverly Hills, Calif., on Nov. 7.

Meanwhile, if there's a sudden shortage of expensive baby booty, blame Christina Aguilera, who can't seem to get enough of tot-geared shopping trips.

But is she getting more specific in her stork sprees?

According to the New York Daily News, the makeup-slathered pop queen dropped a major hue hint while recently registering at go-to Los Angeles baby boutique Petit Tresor.

She reportedly selected $12,000 in chichi products destined to end up covered in various infant excretions, all in the color blue.

Among Christina's must-have items: a crib ($3,100), argyle bedding ($680), a silk bassinet ($800) and a stuffed cashmere puppy ($200).

OK! magazine recently reported that the peroxide- and red lipstick-dependent singer's pals went with a blue theme for her shower, while In Touch claimed that, during the event, she was rubbing her belly and referring to her bundle of joy as Jordy, a nod to her music executive husband Jordan Bratman.

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