In a Thursday preview of her interview withGayle Kingon CBS Mornings (which airs in full on Friday), Chen, 45, reveals that shortly afterwelcoming her daughterGia Virginia, she started experiencing postpartum complications and eventually was diagnosed with Bell’s palsy.

“When I went home, I started to feel like … my tongue felt strange,” she says.

“It felt a little tingly, just starting to get a little bit numb. And then I realized my face just felt weird. I didn’t know what the feeling was that I was having. It felt weird.”

Never miss a story — sign up forPEOPLE’s free daily newsletterto stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.

“Did it look different to you? Your face when you looked in the mirror?” King asks Chen. “Yeah,” she responds.

“When I got home, it was like everything was starting to just fall down on itself. Like, my face was melting on itself,” Chen explains. “And then a week after giving birth, that was when it all hit. And I called my doctor, and I … was trying to eat.”

CBS

Tiffany Chen recently gave birth to her first child with partner Robert De Niro. Tomorrow, she reveals a postpartum complication to co-host Gayle King

She continues, “I went to put a fork of food in my mouth and everything came out. I couldn’t eat. And then I was starting to slur. So I said, ‘There’s something really going on here.’ "

Chen was immediately told, “‘Go right to the hospital.’ [The hospital] admitted me. And I lost all facial function the minute I got into the hospital,” she says.

Steven/AFF-USA/Shutterstock

Robert De Niro and Tiffany Chen attend ‘Kiss The Future’ Opening Night documentary film premiere

De Niro, 79, and Chen first sparked dating rumors with aPDA-filled outing. The pair met years prior when filming a movie together in 2015. Chen, a martial arts instructor, had a role in the projectThe Intern, which starred De Niro.

For the full interview, tune in to CBS Mornings on Friday, July 14 at 7:00-9:00 a.m. ET.

source: people.com