The so-called "Burger King Baby" was left at the restaurant just hours after her Sept. 15, 1986 birth, with no note or indication left behind as to the identity of her biological parents.
Deprill launched a search on social media three weeks ago to try to track down her birth mother.
Deprill's birth mother, who didn't want to be identified, saw her daughter's request to meet her and approached an attorney on how to facilitate the meeting. Allentown attorney John Waldron arranged the reunion Monday, the Allentown Morning Call reported.
"It was pure shock to see it was actually her standing there," Deprill said. "The first thing I got was my hug that I wanted."
Waldron said Deprill's birth mother became pregnant when she was raped at age 16 and hid the pregnancy from her family. She gave birth at home when she was 17, and dropped Deprill off at the Burger King knowing someone would find the baby there.
"She kissed the baby on the forehead and left," Waldron said. "She was a kid in high school. Back then, you couldn't just go to a hospital and drop the baby off, no questions asked."
He said the resemblance between the two women is "crystal clear."
[Allentown Morning Call]
Celebrity Couples of 2014 [PHOTOS]