In a video posted to her Youtube channel on Tuesday, the former Las Vegas star's 4-year-old son, Brooks, nearly spills the news, but gets excited when his mother opens a big box to reveal a bunch of blue balloons.
Sims' husband, Scott Stuber, is also excited about having another son. "When they first told my husband we were having a boy, I swear he almost started crying," she gushes. "It's happening. We're having a boy."
While at the Casamigos Tequila Halloween party a few weeks ago, Sims told ET that she already has some names in mind. "If it’s a boy, I love Wesley and Finley and Dutch and Wilder," she shared.