Jessica Simpson has reached her target weight.

The reality star and mother to daughter Maxwell, 21 months, and son Ace, eight months, has shed 50lbs of her baby weight and celebrated by posting shots of herself in a white dress on Instagram.

Under one picture she wrote: ''First time rocking a white dress this year ...but not the last!! Thanks @weightwatchers! (sic)''

Alongside another picture of her wearing a T-shirt, she added: ''...AND a white T-shirt!!#goalreached thx (sic)''

Jessica - who is engaged to be married to Eric Johnson - also posted a picture of Maxwell, showing how she has inherited her famous blonde hair colour.

She captioned it: ''The most beautiful girl in the world.''

She also posted a picture of her holding Ace, saying he was the ''most handsome boy in the world''.

Jessica - who is a spokesperson for Weight Watchers - has previously said she has set a date for her wedding to former NFL star Eric, 34, and is planning to stay in shape for her big day.

She said: ''I think it's about time! Knowing that I have the wedding coming up is an incentive to stay on Weight Watchers, count my points and stay in the gym. I mean, when you see my dress, you'll know.''