Jennifer Garner is showing off what hard work at the gym can do to a body!

After her early morning workout, Ben Affleck's wifey then ran errands with adorable son Samuel.

While mommy was dressed in black spandex, tennis shoes and a green jacket, her little guy looked comfy in a sleeper.

This is a mama on a mission!

Hilary Duff is a fashionable mama on the run!

The former Disney darling stepped out with beautiful son Luca for a day of errands. We think the baby's pink romper is adorbs!

Hil kept it casual in blue J Brand jeans, black shirt and brown booties. We're lovin' the Louis Vuitton handbag.

See more of Duff and her baby boy in our gallery below.

Jennifer Love Hewitt is ready to dive back into the real estate market.

The former Party of Five star's Toluca Lake home has been listed for $2.9 million.

The 3,216 square-foot pad is a Spanish-style mansion with four bedrooms, four baths, a private pool, spa and lakefront dock.

Hewitt, 33, originally bought the house for $1.7 million back in 1998.

See more of the gorgeous spread in the gallery below.

These days, it seems she's more like a business woman than an actress!

Jessica Alba headed to yet another meeting in Beverly Hills yesterday, and the New Year's Eve actress looked prim and proper in bright blue jeans, a white t-shirt, and a feminine floral blazer. Now that she's founded The Honest Company, it appears the 31-year-old is taking a break from filming to focus on her eco-friendly baby products!

Not only does the mother of two have a full-time acting career in addition to her own business, she's also heading up a major fundraising event for the Democratic National Convention with pal Eva Longoria! The bash, tenatively being called "Super-O-Rama," is aiming to rescue the Democrat's efforts in the independent expenditure sector, so hopefully the A-lister's star power helps the cause!

The Republicans better have some Hollywood hotties lined up to rival these Latina bombshells!

Another day, another photo op!

Kim Kardashian channels legendary singer Diana Ross in her latest photo shoot with Hype Williams, and at first glance we almost didn't recognize her! The 31-year-old shared these behind the scene photos on her official website, and she looks every inch the diva that the Supremes singer is. Fierce!

"Clyde Haygood and Joyce Bonelli glammed me up and we went for a fun, crazy look, channeling Diana Ross. Definitely a new look for me. XO," the Keeping Up with the Kardashians star captioned the snapshots.

To get into character, the brunette beauty sported a huge afro and retro inspired makeup, and although Kimmy was just playing dress up, we think she should stick to her normal beauty routine. We wonder what boyfriend Kanye West thinks of this look?!

This isn't the first time the E! darling has transformed herself into a legendary Hollywood star for a photo session, as she channeled Sophia Loren, Elizabeth Taylor and Cleopatra in previous years.

Just another day in the life!

Matthew McConaughey's taking his upcoming role in The Dallas Buyer's Club super seriously ... the actor has to drop 30 pounds for the upcoming role of real-life AIDS victim Ron Woodroof. The actor showed off his slender frame as he waiting for a cab Friday in NYC.

The movie tells of a heterosexual Texas electrician who was diagnosed with AIDS in 1986; doctors gave him just a few months to live but he refused to accept their prognosis. Instead, Woodroof started an underground alternative treatment operation through which he smuggled illegal medicine to as many AIDS patients as he could. He ended up living six more years and prolonged the lives of countless others.

Whew! Pretty heavy, but pretty awesome -- can't wait to see this film!

Meanwhile, Matthew, 42, has got a third baby on the way and while wife Camila Alves gains weight in her baby bump, MM's got to avert his eyes while she's eating. He told reporters of his weight loss plan: "I am drinking a lot of tea. It takes a while for your body to understand that it has to feed off of itself and that you’re not going to give it something else from the outside."

Rihanna is a true fashionista! One day she's wearing a necklace with a four-letter word, and the next she's wearing a classic-style piece.

While leaving her favorite dinner spot Giorgio Baldi in LA, RiRi rocked a leather ensemble and a stunning Victorian cameo brooch. So chic!

We love when Rihanna wears minimal makeup. Watch her leaving the hotspot in our video below.

Christina Aguilera's latest single "Your Body" has leaked onto the web, and whoa, Xtina is gettin' nasty!

The songstress, who posted the above photo from the song's music video set, is singing the following lyrics: "All I wanna do is f**k your body, tonight's your lucky night I know you want me."

The Voice mentor said the following to Rolling Stone about her upcoming music:

"I'm one that likes to collaborate. I love feeding off the creative energy, and it only makes me better. I'm on a continual path both personally and professionally. All-around, it's my goal to better myself as a person and an artist, and the show is one of those contributing factors and the guys are great friends at this point. It's fun collaborating with them at this point."

Aguilera, who has been dating Matt Rutler for over two years now, sings: "I came here tonight to get you out of my mind, I’m gonna take what I find. So open the box, don’t need no key I’m unlocked. And I won’t tell you to stop."

X-Rated Xtina ... loves it!