Cuteness alert!

Jessica Simpson tweeted a sweet picture on Sunday of her daughter Maxwell and sister Ashlee Simpson's son Bronx. The adorable duo posed for the camera, showing off their matching curly blonde locks. 

While Jessica and fiancé Eric Johnson's 6-month-old son Ace Knute is missing from the candid pic, we love to see Bronx and Maxwell spending time together!

The mother-of-two is sharing more than family photos with her fans -- she's also dishing on how she got her post-baby bod back!

In an interview with USA Today, the 33-year-old says she gained "a good amount" of baby weight with Ace but credits her weight loss to Weight Watchers

She first followed the company's Simple Start plan, a two-week program that doesn't require members to count points. Now, she uses the PointsPlus program.

The hot mama stays in shape by working out with trainer Harley Pasternak four days a week for 45 minutes. "It's a lot of resistance training, lots of lunges and squats. There are bursts of cardio throughout the workout as well," she says.

Though her weight has been talked about in the tabloids for years, the blonde beauty isn't worried about sharing her diet and fitness struggles.

"People are going to talk about this no matter what. I might as well choose to live a healthy lifestyle. It does get old having people harping on how much you weigh or your body after pregnancy. I need to feel comfortable in my own skin. People are going to pick me apart no matter what I do. I'm always going to have critics out there who will make a story out of something."

So, is she ready to add to her beautiful brood?

Simpson says she "can't even think about being pregnant again right now. I would never say never."

Click "Launch Gallery" above to see Jessica's little ones and other stars' cute celebrity kids!

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