Mila Kunis once delivered quite the inadvertent shock to her UPS driver.
The star of A Bad Moms Christmas opened up to PEOPLE for this week’s issue about an incident shortly following the birth of now-11-month-old son Dimitri Portwood, when she’d left her front door unlocked.
“My UPS guy is really sweet, and I’ve had him for years, and he always [just] drops off the package, but you can see him through the glass window,” she tells PEOPLE. “At one point, I was just shirtless, because I was hot. I was just with my baby, and I was three days postpartum, so it still was like [I was] pregnant.”
“I was just like, ‘Hey.’ Didn’t even think about it, naked, skin-to-skin with my baby,” recalls the actress, 34. “And he just puts the package down and looks up. And I was like … I didn’t even care.”
Want all the latest pregnancy and birth announcements, plus celebrity mom blogs? Click here to get those and more in the PEOPLE Babies newsletter.
RELATED VIDEO: Mila Kunis and Ashton Kutcher Aren’t Giving Their Kids Christmas Gifts This Year
Kunis admits she “wasn’t really embarrassed” about the slip and “felt more bad for the UPS guy” than herself. “I was like, ‘This is not nearly what you thought you were walking into,’ ” she jokes.
“I think he may have been like, ‘Oh, that’s what they look like?’ You know, a nursing breast and a [non-nursing] breast. It’s just two very different boobs.”
FROM PEN: Emily Maynard Johnson Admits She Was Ashamed to Stop Breastfeeding Her Second Son Early
“I guess that could have been an embarrassing moment, but I was in bliss,” she tells PEOPLE. “I was like, ‘My baby!’ ”
For more parenting confessions from Mila Kunis and the rest of the cast of A Bad Moms Christmas, pick up the latest issue of PEOPLE, on newsstands Friday.