Ashlee stunned in a curve-hugging off-the-shoulder, floor-length Jay Godfrey jumpsuit, which she paired with a floral embroidered chain handbag. She wore her long blonde locks in loose, barely there waves and finished the look with a smoky eye and nude lips.
Evan was clearly enamored by his wife, writing on Instagram, "Loved last night. Every minute of it. #artshow #freedomunitedfoundation.. and look at my Sexy Wife."
Ashlee also praised her husband, who had art in the show, posting a sweet pic from the event of the pair sharing a smooch. "I wish you could all see what we saw tonight. My husband is an amazing artist, and I am so proud to be his love ," she wrote.
Though the adorable duo seemed to only have eyes for each other, Ashlee and Evan spent the evening with two of their famous family members: Evan's older sister, black-ish star Tracee Ellis Ross, and Ashlee's father, manager-turned-photographer Joe Simpson, who is recovering from his battle with prostate cancer.
The entire extended Simpson-Ross clan has plenty to celebrate this week. Ashlee and Evan's daughter, Jagger Snow, turns 2 on Sunday. They've been sharing tons of cute pics of their baby girl over the past year -- watch the video below to see one of our favorites.