Despite the recent passing of her beloved father, Cameron Diaz put on a brave face last night for the premiere of What Happens In Vegas - a brave face with a big ol' grin, that is!

The Angel was all smiles and delight last night as she walked the red carpet with co-stars Lake Bell and Ashton Kutcher. (Maybe that explains Cam's sudden change in demeanor - after all, who could stay sad around a legendary cut-up like Ashton?)

Seriously, we couldn't be happier to see Cameron looking so happy - we're sure she's still grieving, but it's good to see her getting on with her life!

This clip of the upcoming What Happens in Vegas was accidentally "leaked" to MySpace Celebrity and Ashton Kutcher decided to post it to his celebrity blog.

Is this for real? I mean ... obviously they're not really drunk, they're both just really great actors, right?

We just caught hottie Ashton Kutcher at Lisa Kline on Robertson Blvd, but don't let those shopping bags fool you! The punkster was being followed by a camera crew, so presumably he's shooting a scene for his new movie Spread. However, we all know that Robertson is paparazzi central, so perhaps he's doing something for Pop Fiction. While we'd like to think he was shopping for Demi and himself, we're pretty sure he's up to something else!

Ashton Kutcher may be more famous for being the ultimate cougar bait and the creator of shows like Punk'd and Pop Fiction, but he's got a day job, too!

Ashton got back to work shooting his new film Spread yesterday afternoon.

Let's hope it's a bigger success than his latest small screen endeavor, which, although a brilliant idea, kinda fizzled after the first episode.

Our photographers caught Ashton Kutcher hard at work filming Spread yesterday afternoon. (Well, either that or an extremely elaborate episode of Pop Fiction - but I guess we'll just have to wait to find out!)

We admit it, we were fooled by some of Ashton Kutcher's stunts for his new show on E!, Pop Fiction, which gives celebs the chance to punk the media by pulling pranks on the paparazzi.

Last night, they revealed that Paris' shaman and Avril's baby bump were just stunts, and it got us thinking. What ELSE is a prank?

Is Britney really dating a paparazzo?

What about Kate's here today, gone tomorrow baby bump?

Is Lindsay really addicted to Ariva?

What do YOU think?

You just know Ashton Kutcher was looking around for pranksters yesterday when he saw a parking officer standing by his car - but unfortunately for the star, the ticket he got was no joke!

We spotted Ashton out in Hollywood pleading his case to a parking officer. He tried everything to charm his way out of the ticket - even taking the officer for a twirl!

Unfortunately, despite his fancy footwork, Ashton still walked away with the ticket. Sorry, man - guess there's no dancing your way out of this one!

Ashton Kutcher's big 30th birthday party earlier this month sure looked like fun - but we're guessing the guests probably wish they'd stayed home instead!

The New York City Health Department issued a press release yesterday warning of a potential outbreak of hepatitis A stemming from a bartender at Socialista who worked on February 7th - the same night and location as Ashton's party!

That means that everyone who attended the party's at risk of contracting the dangerous disease - and considering the party's stacked guest list, that could mean half of Hollywood's got a shot to take!

Guests at the party included Madonna, Kate Hudson, Bruce Willis, Gwyneth Paltrow, Lucy Liu, Liv Tyler, Eric Dane, Rebecca Gayheart, Salma Hayek, Molly Sims, Amy Smart, Ivanka Trump, Parker Posey, Ali Larter, Rachel Zoe, and Roberto Cavalli, among others.

Thankfully, hepatitis A isn't the end of the world - the Health Department estimates that 80-90% of patients vaccinated within 14 days of exposure recover fully, and that fewer than one percent of all hep A cases prove fatal.

Let's hope everyone's already gotten their shots!

Ashton threw a party - and everybody came!

Yes, the whole A-list turned out to celebrate Ashton Kutcher's 30th birthday last night in New York - we spotted Lucy Liu, Salma Hayek and Francois-Henri Pinault (again!), Eric Dane and Rebecca Gayheart, Liv Tyler, Lucy Liu, and Ashton and Demi's Kabbalah buddy Madonna stopping by the Bowery!

Now that's what you call a kick-Ash guest list!

Ashton and Demi celebrated Demi's 45th (45?!?!) birthday this week at the house Girls Gone Wild built in Punta Mita, Mexico (The house is owned by the incarcerated Joe Francis.) The couple spent the day lounging in the sun, surprising given how vigilant Demi is about keeping her body looking young! She may be 45, but she'll never be too old to strut her stuff in a teeny bikini (thanks to the wonders of modern medicine.) But now that Ashton's fast approaching 30, is he still considered cougar bait?

We spotted Demi Moore and Ashton Kutcher out and about in Hollywood last night. We gotta say, Demi was looking spectacularly young - heck, she almost seemed age-appropriate for Ashton!

L.A.'s hottest cougar, Demi Moore, is complaining about ageism in Hollywood. The once-famous actress (now 44) explains that "for many female actors, who turn 40, it means the end of their career, it's time to retire." Really? I didn't know the film industry cared about looks. Demi also says that whatever roles there are for women over 40 "don't have much substance." On the contrary, I thought Striptease was bursting with intelligence and meaning!

But in all seriousness, Demi's managed to snag the handsome (if mischievous) Ashton Kutcher, pop out three kids with action star Bruce Willis and been able to stay looking fabulous (with a little scientific help, of course). So what if she's not acting as much anymore? She was never that good to begin with!

Let's take a break from the Beckhams for a moment to take a look at another Hollywood couple: Ashton Kutcher (who still thinks he can pull off bandanas) and Demi Moore (who still thinks she's under 40). The couple dined out - with Salma Hayek! - on Saturday night, and the twosome (especially Demi) looked strangely bothered. Is it because she's already regretting Mr. Brooks? Nope, it's because she accidentally ran into a pole earlier in the night while avoiding photogs at Nic's Martini Lounge! Gotta watch yourself, Demi - do you think she did it on purpose so she wouldn't have to look at Ashton's, uh, kerchief?

We've seen star-studded red-carpet events for movie premieres, awards shows, even old-folks prom - but if you really want to see the stars shining, nothing brings 'em out like a good old-fashioned book party! Last night, for instance, we spotted Jennifer Aniston, Demi Moore, and Ashton Kutcher making the scene at the ONE Sunset to meet Laura Day (the lady in white next to Jen), author of the celebrated blockbuster self-help book The Circle. We're a little surprised to learn that stars as big as that trio would have any use for self-help literature - but then again, that's probably the most telling sign of a good self-help book!

Ashton hit up Teddy's Saturday night, sans Demi. It's no shock that a 29-year-old actor would want to spend a Saturday night at one of Hollywood's hottest spots, but it is interesting to note that he picked a club that step-daughter Rumer (who's closer in age to her step-dad than Demi is) likes to frequent. Could this mean trouble in May/December romance-land for Ashton and Demi? Or does Kelso just need to spend a Saturday night every now and then partying with people his own age?

...line, that is - as in "Check out the hemline on the dress Demi Moore's daughter Tallulah Belle wore to the Mr. Brooks premiere last night!" We're not ordinarily the type to be easily shocked by the clothes parents allow their children to wear out of the house these days, but, uh, damn, that's kinda high, isn't it? (Sure looks like Ashton would agree with us - from the expression on his face, he must be wondering if someone's enlisted his daughter to help Punk him good!)

Granted, it can't be easy having a camera shoved in your face 24/7, but there are some stars that handle it with grace (cough, Paris Hilton!) and some that prefer water, soda, harsh words, bare hands and other sharp objects!

Click through to see who else loses it in front of the lensmen!