In the pic posted to her Twitter account late Thursday night, Duff flashes her baby bump, which has a gift box painted on it with the inscription, "Happy Holidays."
"Happy holidays from the three of us!!" the 24-year-old star tweeted before thanking the painter, her 26-year-old sister Hailey. "What would I do without you and your artistic ways!"
The Cheaper By The Dozen beauty married the baby's father, 31-year-old NHL journeyman Mike Comrie, on August 14, 2010 in Santa Barbara, California.