VIDEO: Sneak Peek - 'The Big Day' Episode of NBC's THIS IS US

On the next episode of THIS IS US on NBC titled "The Big Day," as the birth date of her triplets quickly approaches, a frazzled and emotional Rebecca forgets Jack's birthday. Dr. K struggles with the loss of his wife and wonders how he'll be able to continue on with his life without her. Joe - the firefighter who delivered baby Randall to the hospital - fights to save his marriage. The episode airs Tuesday, January 17th on NBC. Get a sneak peek below!

About the show: Sometimes life will surprise you. Starring Mandy Moore ("A Walk to Remember"), Milo Ventimiglia ("Heroes," "Gilmore Girls") and Sterling K. Brown ("The People v. O.J. Simpson: AMERICAN CRIME Story"), this refreshingly honest and provocative series follows a unique ensemble.

As their paths cross and their life stories intertwine in curious ways, we find that several of them share the same birthday, and so much more than anyone would expect. From the writer and directors of "Crazy, Stupid, Love." comes a smart, modern dramedy that will challenge yo

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