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Cameras follow Lindsay Lohan everywhere she goes, but she's not about to live with them ... telling friends she has no interest in doing "Celebrity Big Brother."

With LiLo arriving in London yesterday (see above), the rumor mill spun into overdrive ... saying Lindsay was in town to film the super-popular British show.

But according to our sources, the idea is "completely untrue" and total "nonsense." As one source pointed out ... how could she lock herself in a home for a few months when she has a court date next month?

Doing her best Dennis the Menace impression, Kristen Stewart hopped out of a truck in L.A. armed and not-so-dangerous ... with a slingshot in her back pocket.

We don't know what the 22-year-old was taking aim at yesterday, but as long as it's not married directors ... everything should be fine.

An 18-year-old looking after a 3-year-old is pretty ordinary, but when that 18-year-old is Justin Bieber and the kid you're watching is the son of L.A. Clippers star Chris Paul ... AND you do it courtside at Staples Center ... it's just awesome.

Bieber had a front row seat last night as little Chris Paul II watched his daddy and the Clips dismantle the Boston Celtics, 106-77 -- which propels the team's winning streak to 15.

With her guardianship situation settled for the moment, Ariel Winter spent yesterday acting like an actual 14-year-old girl by going go-karting in Burbank.

Winter's sister, Shanelle Gray, cemented her role as temporary legal guardian earlier this month, with her lawyer and dad now in control of her finances.

But soft! What light through yonder window breaks? It's Jennifer Aniston, who continued her ridiculously hot Mexico vacation yesterday ... looking pensive in a sexy bikini and an exotic red sarong (the thing wrapped around her waist).

As we reported, Jennifer and her tatted-up fiance Justin Theroux have been kicking it in Cabo San Lucas over Christmas, and things just keep heating up.

Still unclear if Jennifer's pregnant -- but if you're wondering what it's like to get held up in Mexico ... just ask her boobs.

Heidi Klum performed a supermodel magic trick Wednesday ... riding bitch with an extremely large helmet and then removing it ... only to reveal a perfectly coiffed head of hair.

Heidi was riding with her bodyguard-BF Martin Kristen in Venice, CA when she showed off her hat trick.

They've taken a serious step in their relationship, wearing similar get-ups, including hipster sunglasses.

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.

Russell Simmons could teach Halle Berry a thing or two about breaking up. He's on such good terms with ex-wife Kimora Lee, he kicked it with her AND new GF Hana Nitsche Wednesday on the beach in St. Barths.

Simmons and Kimora Lee divorced in 2009 ... but they stayed unusually and refreshingly close post-split ... sometimes vacationing together with their respective SOs.

There's no question Russell can pull some impressive ass -- but we gotta ask ...

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.

Who knew? Justin Theroux is tatted neck to toe.

The pics were snapped in Cabo San Lucas, Mexico over the weekend. Jennifer Aniston, who at 43 still looks mighty fine, and Justin were catching some rays when he stood up and revealed a back tat that looks kinda ... Asian-y.

Jennifer makes a yearly pilgrimage to Cabo around XMAS time and usually George Clooney follows suit -- this time with lucky Stacy Keibler. And Rande Gerber and Cindy Crawford always make the trek as well.

FYI --There are reports circulating that Jennifer is pregnant. If she's really pregnant, Jessica Simpson has been doing it seriously wrong.

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!

Stephanie Seymour's butt is unavailable at the moment -- as it's currently on vacation in St. Barts.

If you would like to leave a message for the butt, please do so at the beep.

Honey Boo Boo and family recently transformed their home for the holidays ... and it's a full blown fire hazard of epic proportions.

Inflatable Santa, inflatable Frosty, inflatable Rudolph -- pretty much every Xmas character ever makes an appearance in their yard (sorry Jesus). The reality TV stars also strung up enough lights to ensure their redneck haven will finally be seen from space ... an Xmas miracle!

Here's a photo of Rihanna in Barbados ... in a bathing suit ... where she'll be spending her Christmas holiday relaxin' like a she-pimp in 81 degree weather.

FYI -- it's 36 degrees in NYC right now ... 53 and raining in L.A. ... 14 degrees in Minneapolis ... 37 in Dallas ... 52 in Atlanta ... 32 in Boise ... etc, etc, etc.

Cops were called to the Barbados house Sunday where Rihanna is staying -- presumably topless -- after a man trespassed onto the property.

Barbados Police tell TMZ ... they received a call from someone in Rihanna's party after a man believed to be a German national (above) wandered onto the private, beachfront estate.

By the time cops arrived, Mr. Beerfest had already beat a hasty retreat -- and we're told at no time was the singer in danger.

Brooke Mueller got her shopping fix last night by taking her twin boys to The Grove in L.A.

Mueller is back with her kids after a rough few weeks. She checked in and out of rehab in just 6 days -- her 19th visit.

She also got into a heated battle with Denise Richards after Denise (whom Brooke entrusted with her kids while she was in rehab) dared to ask if she could take the twins to Charlie Sheen's Christmas party. In case we have to paint the pic, Brooke is at war with Charlie.