Jessica Simpson was feeling colorful on Saturday, June 22, showing off her growing baby bump in a flowing tie-dye dress while grabbing lunch with her fiance Eric Johnson in Santa Monica, Calif.

PHOTOS: Jessica Simpson's baby bump style

Skipping heels, the Fashion Star mentor, pregnant with her second child, wore jeweled flip flops with the beaded dress, accessorizing with a pink canvas bag and sunglasses. The 32-year-old held hands with her former NFL player beau, who kept his look casual with flip flops, khaki shorts, brown T-shirt and a Boston Redsox hat.

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Due to give birth to a son this summer, Simpson looked ready to pop while walking into the restaurant.

Post-baby, a source tells Us Weekly that the singer hopes to finally tie the knot with Johnson, 33, whom she got engaged to in 2010.

PHOTOS: Jessica's daughter, Maxwell

"[She] was telling friends she wanted to get married a few months after the baby is born," a source told Us. "Let's have this wedding already before I get pregnant with another one!'"

The couple are already parents to daughter Maxwell, 13 months.

This article originally appeared on Jessica Simpson Shows Off Baby Bump in Tie-Dye Dress