Looking good, mama!

Jessica Simpson is happy … just ask her! The mom of two is showing off her impressive weight loss in a new commercial for Weight Watchers.

Wearing a skintight white dress, the 33-year-old, who is the spokeswoman for the diet food company, says in the ad, "When I started Weight Watchers, I didn't know what to expect at the meetings."

The perky blonde continues, "It reminds me we don't have to do this alone. It's so much better to have some back up since we all face similar challenges. I can honestly say I've never been happier!"

Jessica has a lot to be happy about. The singer-turned-designer has been busy planning her wedding to fiance Eric Johnson, whom she has been engaged to since November 2010 and she has two children, daughter Maxwell Drew Johnson, who was born May 1, 2012, and son Ace Knute Johnson, who born June 30, 2013). And she's looking better than every!

Keep up the hard work Jess, it's really paying off!