Baby Watch

6:00 AM PST -- Matthew posted on Facebook ... Camila gave birth to a baby boy, who they named Livingston.

Matthew McConaughey's wife just popped out baby #3 ... TMZ has learned.

Sources tell us ... Camila Alves gave birth earlier this morning at a hospital in Austin, TX. We're told Matthew was there, he was ecstatic for the new arrival (clearly) ... and even looked like he'd packed on a few pounds.

You'll recall ... the actor announced news of the pregnancy back in July, tweeting "Happy birthday America, more good news, Camila and I are expecting our 3rd child."

We haven't confirmed yet, but sources close to the situation tell us ... it's a baby girl!

FYI -- The duo met in 2006, but didn't get married until June 2012. They have two other children: Levi (4) and Vida (2).

Jessica Simpson's new baby has hit the milk-dispensing JACKPOT -- and lucky for us, the singer's already giving out a sneak preview of the goods.

Jessica -- who's currently on vacation in Hawaii with her fiance and baby #1 -- just posted the ample photo on Twitter ... with the caption "Fun in the sun." And we have to agree.

Jessica Simpson and Eric Johnson are going to extremes to hide something -- like every inch of their bodies during their family vaca in Hawaii.

We've already seen Jessica covering up on the beach since announcing her pregnancy ... but during a Christmas Eve stroll on the beach even Eric was cloaked from head-to-toe while carrying baby Maxwell.

Far as we know ... Eric doesn't have a deal to drop lbs on Weight Watchers.

The only Simpson not in undercover mode these days is Ashlee Simpson ... who proudly showed off her bikini bum.

Jessica Simpson raked in millions of dollars from Weight Watchers to drop her baby lbs -- just in time to put it all back on with a brand new fetus! Busiest womb in Hollywood, folks.

Jessica Simpson is hiding something -- because the newly pregnant singer just hit the beach in Hawaii ... wearing an enormous green cover-up thing.

Just one day after announcing her new bun in the oven, Jessica went out for a waterfront stroll today with her fiance Eric Johnson ... and her rapidly-forming fetus.

This will be Jessica's second child after she gave birth to her daughter Maxwell in May.

So much for rumors Weight Watchers will dump Jessica Simpson now that she's pregnant again ... the company is actually expanding her role in hocking the diet plan ... even though she's taking a hiatus from the diet regime.

W.W. just announced it will not only continue to run the ads touting Jessica's alleged 50 lb weight loss ... it will also push her new 30-second ad -- released today -- in which she announces her pregnancy.

Weight Watchers calls Jessica's weight loss "successful" -- notwithstanding the proof of performance ad showing Jessica substantially covered in a flannel shirt.

As for the future, Weight Watchers says Jessica "will not be following the program during the pregnancy while her weight and well-being are monitored by her obstetrician."

Just two days before she made her big announcement, a secretly pregnant Jessica Simpson took her fetus on a Christmas Eve shopping spree ... and showed off her growing baby bump.

While wearing an animal print tunic-thingy, Jessica hit up a Target store in Hawaii on Sunday to stock up on wrapping paper and all sorts of other competitively priced stuff.

It's unclear how far along she is, but it's gotta be early ... considering you can BARELY see the bulge in her midsection.

Side Note: Her legs look great!

Jessica Simpson just tweeted a photo of her daughter Maxwell playing in the sand in Hawaii next to the words "BIG SIS" .... which can only mean one thing -- JESSICA'S PREGNANT!!!!

Right???

The rumors have been swirling for weeks -- but Jessica has been mum about the mom situation ... until now.

Jessica gave birth to her first child, Maxwell Drew Johnson, back on May 1.

The big question -- how will the pregnancy affect her $4 MILLION deal with Weight Watchers?

9:18 AM PT -- Weight Watchers just posted a tweet, congratulating Jess on the news:

While Jessica Simpson was probably off somewhere trying to elude photographers from catching a glimpse of her maybe baby bump, her fiancé Eric Johnson and adorable first baby Maxwell went shopping on Melrose Avenue in L.A. on Tuesday.

It must be really hard to get Jess a Christmas gift when you don't know what size to buy her.

Jennifer Aniston and Jessica Simpson both have a major glow about them -- and since everyone wants to know if it's because they're knocked up ... we set out to find definitive answers! Hey, we tried.

Here it is ... undeniable proof that Jennifer Aniston is finally PREGNANT ... or not pregnant ... depending on if you can see a baby bump in this photo!!!

The former "Friends" actress was all smiles on her way into a spa in Beverly Hills this weekend ... with what appears to be signs of a "stomach" showing underneath her shirt.

Only Jen knows for sure ... but we should totally guess anyway -- so, we gotta ask ...

Jessica reportedly has a tiny person growing inside of her, but has yet to confirm a pregnancy.

But on Saturday she showed up to Zach Braff's mansion -- where the wedding was held -- in this kind-of-poofy black dress ... which CONVENIENTLY covered her stomach (aka her baby incubator).

At first glance, this seems like an innocent photo of Jessica Simpson leaving King's Fish House restaurant in Calabasas yesterday ... ORRRRR ... is it irrefutable proof that she's ACTUALLY PREGGO WITH A 2ND CHILD?! Let's review the facts ...

Fact: Jessica Simpson was wearing a jacket that covered up her stomach, where babies most commonly grow.

Counter-Fact: It was pretty chilly in L.A. yesterday, so the jacket could have been to provide warmth.

Fact: Pregnant people aren't supposed to eat raw fish!!!

Fact: We probably shouldn't make assumptions

A day before officially announcing she had a little Bush in the oven on the "Today" show Wednesday, former First Daughter Jenna Bush Hager previewed her burgeoning baby bump in workout wear with husband Henry Hager at a Whole Foods in NYC on Tuesday.

George W. Bush's 31-year-old daughter is due sometime in the spring.

We hate to speculate, but ...

Out on a shopping date in Beverly Hills with fiance Justin Theroux yesterday, the ageless Jennifer Aniston seemingly covered her midsection with both a shopping bag AND a jacket as she made her through a parking garage.

So we ask ...

Prince William and Kate Middleton's unborn heir is already raking in the best baby gear money can buy ... for FREE! And yes, it's totally weird to be jealous of a fetus -- but we are.