Jessica Simpson Spills a Weight Loss Secret

PHOTO: Jessica Simpson posted this photo on Instagram with this caption: " …AND a white T-shirt!!#goalreached thx @weightwatchers," March 6, 2014.
WATCH Jessica Simpson Shines in Fitted White Dress

Jessica Simpson has earned her bragging rights!

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After giving birth to two children in two years, the singer, 33, revealed on Instagram that she has finally reached her weight goal.

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In a series of two photos, Simpson wrote, "First time rocking a white dress this year ...but not the last!!Thanks @weightwatchers! ... ...AND a white T-shirt!!#goalreached thx @weightwatchers"

Simpson told ABC News in October that she was shocked by the weight she gained during her pregnancies. So, she turned to Weight Watchers, a program for which she is a spokeswoman, to get back in shape.

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"I'm taking it week by week so I don't get frustrated with myself," she said at the time. "If I had a long-term goal, and that's all I thought about it, I think it would set me back more. So I really, every week, try to make sure I stick with my points and get four workouts in. That's my goal this week, and I hope that I can lose from that. If not, I'm going to keep on going and try it the next week. So far, so good."