Ringwald, 41, and her husband Panio Gianopoulos, welcomed daughter Adele Georgiana and son Roman Stylianos after a natural birth on Friday, July 10 in Los Angeles, according to People.
The two new additions will join their five-year-old sister, Mathilda Ereni.
"I actually think [the age difference] is a good thing considering we're having twins, as it would be so much harder with a toddler than with an almost 6-year-old," the '80s icon told Fit Pregnancy in June.
Ringwald's pregnancy was written into Secret Life. Her character, Anne Juergens, is expecting a baby, while her teenage daughter, Amy, has just given birth. The two will be raised side-by-side.
What do you think of the names Adele and Roman?