The model and Project Accessory host and husband Scott Stuber, who got engaged last May and wed in September, are expecting their first child together this summer.
"I am absolutely, positively, downright over the moon to announce that we are pregnant! There are simply no words to describe the feeling... I finally get what they mean when they say pregnant women GLOW," Sims wrote on her website Tuesday.
"Our little bundle of joy is a honeymoon baby, due at the end of June. A first pregnancy is a nerve-wracking experience of course, but mostly we are just thrilled and excited. We can't wait to meet him or her."
Sims, 38, also revealed she creatively shared the big news with Stuber, 42, over Chinese food.
"I hijacked the fortune cookie and typed a new message so that when he opened his cookie at the end of the meal, he found out he was going to be a daddy. You can only imagine how nervous I was during the entire meal (I think I ate a total of two bites...), but the look of surprise and pure joy on his face was priceless," Sims added.