Stepping out for a swanky evening in New York City, Jessica Alba and her husband Cash Warren were spotted at the 2009 American Museum of Natural History’s Museum Dance last night (March 26). The “Good Luck Chuck” hottie and her hunky hubby both looked stunning as they milled around the event, schmoozing with fellow celebs like Milla Jovovich and Tinsley Mortimer.

On the home front, it seems Jess and Cash are very interested in giving their daughter Honor Marie a little brother or sister in the not-too-distant future.A source told press, “Jessica and Cash are working overtime to get pregnant. She and Cash are boasting that they love being parents and are determined to expand their family as soon as possible.”