Nothing -- not even 30 years -- could come between Brooke Shields and her Calvins.

Shields told Ellen DeGeneres as much on during her talk show this week. The 45-year-old model turned actress revealed she's still able to slip into the same pair of denims she sported at age 15 in her controversial Calvin Klein Jeans ad.

"They didn't look pretty," she admits about tying them on again, "but they fit."