Jessica Simpson Celebrates Fiancé's Birthday (PHOTO)

Jessica Simpson shared a night out with her fiancé Eric Johnson celebrating his birthday over the weekend.

"Birthday weekend!!! I love you with everything and more and more and more," Simpson posted to Twitter on Saturday, Sept. 14 along with a photo of herself with Johnson.

The parents of two left their daughter and infant son at home while out in Santa Monica, Calif. celebrating the NFL star's 33rd birthday.

Simpson just gave birth to her son Ace less than three months ago, but the actress revealed confidence in a mini skirt and a black-and-white print jacket as she flashed a bright smile at photographers.

Furthermore, Simpson went all out for Johnson's birthday celebrations, which included bowling and dinner at Benihana, according to Us Weekly. Friends such as Cacee Cobb and Simpson's sister Ashlee joined the pair.

Meanwhile, Simpson and her fiancé Eric Johnson are also parents to 16-month-old daughter Maxwell Drew.

Although the actress appears to be making her way back to her pre-baby weight, Simpson admitted that she had trouble adjusting her body after her first pregnancy, and compared herself to other celebrity mothers.

"I'm not a supermodel. My body is not bouncing back like a supermodel," she said in an interview with USA Today last fall. "I'm just your everyday woman who is trying to feel good and be healthy for her daughter, her fiancé, and herself."

As for her pending nuptials to Johnson, Simpson remains mum, but revealed that plans for "where and when" are set.

Nevertheless, the actress recently gushed about the tight end.

"Eric is beyond any father that has ever existed," Simpson told Us Weekly. "He will do it all without complaint. I can honestly say that I have not had to change many diapers! At the same time, he makes me feel like I'm an incredible mom and still a great lover and woman. And I still get my back rubs!"