Cameron Diaz filmed The Other Woman in New York City with Leslie Mann and a Great Dane on Monday, and her face is definitely starting to look 40, but her body could easily pass for that of a 20something!

So what's the movie about? "After realizing she is not her boyfriend's primary lover, a woman teams up with his wife and plots mutual revenge," according to a synopsis on IMDb. So who plays the adulterous hubby? Game of Thrones hottie Nikolaj Coster-Waldau ... can't wait for this!

She's dedicated!

Cameron Diaz was all smiles on Friday as she hid behind a plastic cup as she left the Tracy Anderson gym in Los Angeles.

The 40-year-old actress has become a mainstay at the popular gym as it's become part of her daily routine.

Gotta love her work ethic!

Why is Cameron Diaz hiding her gorgeous mug?

The super fit actress, who ditched her makeup for the sweat session, left the gym in Studio City wearing her workout gear which included a super cute and bright red puffy vest!

The 40-year-old There's Something About Mary star definitely knows how to maintain those toned legs. What a beauty!

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Someone looks a bit curvier in the breast region these days!

Cameron Diaz, and her larger chest, hit the red carpet in London, England for the world premiere of Gambit at Empire Leicester Square.

The 40-year-old blonde bombshell rocked a sexy and plunging Stella McCartney two-tone dress.

No one can deny that Cam's tight and toned body is bangin'!

When your ex-boyfriend gets married and you're still single, what better way to cheer yourself up than with a shopping spree at Gucci?!

That's exactly what Cameron Diaz did this morning, when we caught her covertly heading in the back door of the designer boutique in Beverly Hills. Sporting new bangs and red lips, the A-list actress brought a mystery male with her to her retail therapy session. We wonder if Cammy D has a new man?

Any hopes of reuniting with former love Justin Timberlake were dashed today, as the "SexyBack" singer tied the knot with Jessica Biel in a romantic Italian ceremony.

At least she has pals like Gwyneth Paltrow and Chelsea Handler to keep her mind off worrying about finding her own Prince Charming!

Gwyneth Paltrow and Cameron Diaz have hot bodies AND killer rap skills.

Both sexy actresses performed a wrap to celebrate pal Chelsea Handler moving her show Chelsea Lately to a new studio.

Gwynnie raps, "We heard that you got a brand new studio, but we know that you got on TV by being a ho!”

The mom of two even throws a jab in there about Chelsea and 50 Cent. You gotta take a listen!

Cameron Diaz covers the November issue of Esquire UK, and the 40-year-old actress talks about everything from aging to the possibility of having children.

"For the first time in my life I’m content," she tells the mag. "I’m so excited. Getting older is the best part of life. Like, I know more than I’ve ever known. I have gratitude. I know myself better. I feel more capable than ever. And as far as the physicality of it, I feel better at 40 than I did at 25."

When asked why she has never married, she exclaims, "I’m smart! No, it’s hard to say. It just wasn’t the thing I was drawn to. I certainly didn’t want it in my 20s. Or my 30s. So we’ll see. I’d always wanted to get hitched in Vegas at least three times. It’s funny because as my girlfriends get older, I see how their relationships have evolved, and you know, the people you’re drawn to changes. I’m not attracted to the same people that I was drawn to in my 20s."

So what about having kids? "There’s still a possibility of that, I ain't that old," she says. "Believe it or not, I’m feeling very ... capable."

Diaz says she keeps her figure toned with regular Pilates sessions, and when asked how one ages gracefully, she says, "There’s no such thing as anti-aging. You can’t go back in time. So for me, it’s about living in this moment, the best that I can. Contentment is about coming to terms with life as it is."

Click the gallery below for more hot shots of the Bad Teacher babe!

Drew Barrymore is about to become a first-time mom, and BFF Cameron Diaz is helping her celebrate!

The actress threw her Charlie's Angles costar the ultimate baby shower in her back yard for around 50 guests on August 4, where they noshed on chips and guacamole and played in the pool, according to Us Weekly.

Drew’s new hubby of two months, Will Kopelman, was also in attendance, and there was even a bouncy castle on hand for the kids!

Barrymore is due within the next few weeks -- congrats!