What an emotional day! In a first look at E!'s forthcoming Rob & Chyna Baby Special, Blac Chyna breaks down in tears and admits she's "scared" while giving birth to her daughter, Dream Kardashian, who was born November 10.

In the clip, Chyna's fiancé, Rob Kardashian, wheels the mom-to-be into Los Angeles' Cedars-Sinai Medical Center in a wheelchair and asks, "Are you scared?"

Moments later, the pregnant model, 28, is seen crying in her hospital bed as the Arthur George sock designer, 29, gives her a sweet kiss on the lips. Rob's mom, Kris Jenner, and Chyna's mom, Tokyo Toni, are also seen in the hospital room as they show their support for the engaged couple.

Earlier in the teaser, Chyna throws a fun-filled birthday party for her 4-year-old son, King Cairo, who she shares with ex Tyga. She also celebrates her baby shower with Kardashian, who appears to be in good spirits despite some tension between Jenner, 61, and Toni.

"Sometimes you intimidate people," the Lashed Bar owner tells her mom, who replies, "I go off when it's deserved. If you not acting accordingly, Imma handle you."

Watch the sneak peek above for more from the reality special, including Kardashian's discussion with close pal Scott Disick about Chyna's decision to give birth to Dream via C-section.

Rob & Chyna Baby Special airs on E! Sunday, December 18, at 8 p.m. ET.

Can't get enough of Us? Sign up now for the Us Weekly newsletter packed with the latest celeb news, hot pics and more!