Jessica Simpson has been proudly showing off her baby girl Maxwell in photos from her fiance Eric Johnson's 33rd birthday.

The singer/actress and her husband-to-be seem beyond happy with their 4-month-old firstborn in the black and white snaps posted on Jessica's lifestyle blog. One picture showed Eric smiling down at his daughter who he is holding in his arms with the caption, 'Daddy's 33rd Birthday!' Another photo shows Jessica, 32, with her child beneath another caption reading: 'Last year at Daddy's party, Maxwell was in my belly. This year she's in my arms!' She has also been sharing Maxwell with her Twitter followers with one image showing her and the happy parents smiling with a firework display behind them.

Although the star seems thrilled with her new life as a mother, losing her post-pregnancy baby weight has been less of a smooth ride. However, she has since embarked on a weight loss programme with Weight Watchers and has reportedly lost over 40 pounds since giving birth to Maxwell. She showed off her new figure on the Katie Couric show 'Katie' and remarked that she was told by doctors that her weight was 'a lot of water' which didn't all come out during the birth. 'I put on more baby weight than I was planning on putting on so I think that I really have to separate myself from the world's expectations and really just look inside of myself and have a relationship with myself and be healthy with myself. That is really important because I want to be a phenomenal role model for my child', she said.