Pete Wentz has joked his wedding to Ashlee Simpson will be inspired by 'Gremlins 2'.

The Fall Out Boy rocker - who got engaged to the singer earlier this year - loves the film, which sees green mischievous monsters take over a New York building.

Pop star Jessica Simpson performed at Camp Pendleton for the troops Thursday night, but took some time to talk about her younger sister's wedding plans. Jessica's sister, Ashlee Simpson, is engaged to Pete Wentz of the Fall Our Boys.

Jessica performed for the troops wearing a skin-tight red top, jeans and black stiletto heels and sang songs such as "These Boots Are Made For Walkin.'" Also performing at the three-hour concert were celebrities such as Snoop Dogg, Janet Jackson, Ne-Yo and Pamela Anderson.

Ashlee Simpson has vowed never to go off the rails. The singer - who recently announced her engagement to Fall Out Boy rocker Pete Wentz - won't follow in the footsteps of troubled stars Britney Spears and Lindsay Lohan because she is in control of her life.

She said: "I don't see myself ever following the path those girls take. I'm almost 24. I'm pretty together and I'm getting married. I wouldn't ever let myself get that way and I don't surround myself with yes-people. I think that's the most important thing."

Ashlee Simpson appears in a red string bikini on the cover of Shape magazine.

The 'Little Miss Obsessive' singer - who has refused to confirm rumors she is expecting her first child with fiance Pete Wentz - proudly shows off her toned figure on the front of the magazine's May issue.

Ashlee Simpson and fiance Pete Wentz went on a double date with Nicole Richie and Joel Madden on Wednesday night.

The 'Autobiography' singer - who is rumored to be pregnant - showed off her flat stomach in a tight black low-cut dress, while Pete wore a green, zebra-print hoodie for the meal at a New York restaurant.