Her character on Mad Men was constantly struggling with her massive weight gain this season, but in real life, nothing could be further from the truth for January Jones!

The X-Men: First Class star showed off her slender post-baby 'bod in white pants and a low-cut tank as she headed to a pilates class in Los Feliz, on Tuesday afternoon.

Jones gave birth to son Xander last September, and while she's yet to reveal the identity of the baby daddy, we spotted the single star wearing a gold band on her wedding ring finger last week. Is it just a fun fashion accessory, or is Jan keeping another big secret?

Jessica Simpson is determined to burn off the baby weight and get her pre-pregnancy body back!

The 31-year-old singer/actress was spotted arriving at her trainer's house in West Hollywood this afternoon, and even though she put on an astonishing 60 pounds when she was pregnant with her daughter Maxwell, it looks like she's already lost a few since she started hitting the gym last week!

Last month Jess confirmed that she inked a $4 million deal with Weight Watchers, but according to various internet reports, she's having a very tough time getting her once flawless physique back. As if that wasn't frustrating enough, a source recently revealed to The National Enquirer that Jess' fiance Eric Johnson is turned off by her fuller figure!

"Her stomach is bloated and laced with stretch marks, and flaps of skin hang over her jeans in a post-pregnancy muffin top," the insider says. "It's got Jessica down in the dumps and wor­ried that Eric is turned off by her body."

The source continued, "When she got preg­nant, Jessica went on a nine-month food bender. She was packing away up to 3,000 calories a day and she still feels like a horse because she's breast feeding. Eric loves Jessica no matter what [but] he's sick and tired of hearing her whine about her new body ... He's turned off by her lack of self-confidence."

How cute are Jen and Violet in their matching sweaters?!

Jennifer Garner left Samuel and Seraphina at home to take her eldest daughter Violet to a children's birthday party in Brentwood, and the Odd Life Of Timothy Green star made sure her little one came bearing gifts! The 40-year-old actress toted a colorful package under her arm on her way to the bash, while little V skipped happily alongside her mom.

Mrs. Ben Affleck seemed a little preoccupied as she texted away on her Blackberry... could a new project be in the works? Or is she calling home to see how her infant baby boy is doing?

Either way, Jen G is one multitasking mama!

Hilary Duff's getting back to her old ways!

The former Disney star was out and about in L.A. today and it looks like all her hard work out is starting to pay off after giving birth to baby Luca. It's as if she was never pregnant!

The 24-year-old actress has been busting her butt caring for her son and keeping up with her workout regime, both of which are daunting tasks, but it's clear that she's taking it all in stride. Guess it won't be long before she turns up the glam!

We're not sure if he's getting into character or if he just likes to walk around with unprotected feet, but here's Ashton Kutcher on the NorCal set of jOBS on Tuesday.

Onlookers could hear Kutcher screaming during filming today, but thankfully it was all part of the script. Patty Jobs, Steve's younger sister, explained to the Contro-Costa Times, "My brother was going through this primal-scream period. I once went with him to a primal-scream session. It was weird to sit in a room with a therapist and scream your head off." Can't wait to see how the Dude, Where's My Car star pulls this one off!

And Ashton isn't the only guy rocking the retro look ... We also spotted Lukas Haas on set with a wig that would make Weird Al proud:

Miranda Kerr jetted out of LAX today, and as always, the Aussie supermodel looked stunning as she strutted through the airport in a pair of sky high Louboutins.

Miranda smiled for the cameras before she went through security, and she doesn't appear to be shaken following a bizarre incident that occurred at the home she shares with husband Orlando Bloom. On Sunday afternoon LAPD arrested a naked man on Miranda and Orlando's property after neighbors saw the individual screaming and diving into bushes.

Hey, it least he didn't break in and try to steal their clothes! Oh wait...

Doesn't he have an assistant to hold that for him?!

Tom Cruise is busy filming his upcoming movie Oblivion in NYC, and the A-list actor proved he's not a diva by holding his own umbrella while shooting scenes at the Empire State Building.

Does this man ever take a break?! He just wrapped Rock of Ages, which hits theaters this weekend, and between working on movies and fulfilling promotional duties, when is he going to squeeze in time for Katie and Suri?!

Mr. Cruise proves you've gotta be nonstop to stay on top!

Lindsay Lohan looks like she's channeling Liz Taylor just fine!

Yesterday, cameras caught LiLo resembling the legendary actress as she was wearing some vintage Bulgari frames made famous by Taylor herself while on set.

Lindsay's been playing it low-key since her car accident with an 18-wheeler last week that could possibly land the troubled actress in more hot water. She does have some good news attached to her name as she will reportedly star in Bret Easton Ellis' new sex-fueled thriller, The Canyons, opposite adult film star James Deen. Looks like the work is slowly starting to come in for LiLo!