One Direction's Zayn Malik Has A Big ... What?

In new clip from 'This is Us' DVD, Louis and Liam break down the mysterious Zayn.

In just six days, fans will be able to get their hands on the DVD for One Direction's 3-D flick "This Is Us". Out December 17, the release will include some never-before-seen footage from the concert film and documentary, which hit theaters back in August.

In a new clip released from the DVD, Directioners are getting to know the sometimes mysterious Zayn Malik a little bit better. "Zayn wears his heart on his sleeve," "Daddy Directioner" Liam Payne shares in the new footage from the Morgan Spurlock-directed flick.

Louis Tomlinson adds, "He's got a real big heart, even though he won't admit it."

The teaser features the hunky singer Face Timing with his mom and later trying to save the life of a fish that his bandmates fished out of a tank at a sushi restaurant.

Louis reveals that Zayn is also a big fan of sleeping. "He doesn't like to get out of bed," Louis shares during a montage featuring "vampire" Malik trying to be coerced out of his bed.

1D's co-producer/songwriter Julian Bunetta opened up to MTV News last month about Malik's love for sleeping while dishing about a Midnight Memories recording session that wasn't included in the theatrical release of "This Is Us."

"So I woke him up — they had just done two shows that day. They're back on the bus; I woke him up at three in the morning or something. Zayn likes to sleep, so I had to wake him up and we just set up in the studio in the hotel room," he shared, noting that during that session they recorded "Best Song Ever," which made it into the movie, as well as "You and I," which was filmed but never released.

No word on if it will make the DVD cut of the movie, but one thing is for sure: the rest of the 1D guys can't stop gushing about Zayn in the film. Louis adds in the teaser, "Zayn's voice actually gives us the edge."