One Direction On 'Today': Niall Horan Pregnant?

Ahead of VMAs, boy-banders talk 'This Is Us,' Zayn's engagement.

No sleep 'til Brooklyn for One Direction. The boys are making a few pit stops before making themselves comfortable in Brooklyn's Barclays Center for Sunday's MTV Video Music Awards, airing at 9 p.m. ET/PT.

First up, the "Today" show, where 1D grew an estimated crowd of 18,000 for their performances of "What Makes You Beautiful," "Kiss You" and their VMA-nominated "Best Song Ever," in Rockefeller Center.

In between numbers, they spoke with "Today" hosts Matt Lauer and Savannah Guthrie — the latter of whom mistakenly called nearly every member of the band Liam — about their upcoming documentary and Zayn Malik's engagement.

"We always say this: There's only so much you can get across in a 140-character tweet," Niall Horan explained of why they let cameras follow them around for the 3D biopic, "One Direction: This Is Us." "We wanted to really give behind-the-scenes access ... to what it's like for us. What it's like for our families, and really what these guys [the fans] have done, really, in three years."

"You're going to see a lot more of what we're like when we interact with each other behind the scenes," Harry Styles chimed in. "A nice insight. It's a great film."

Not to mention where the guys come from.

"A nice look at our families, as well," Liam Payne said. "How they deal with us being away from home. It's nice."

Of course, the big question of the hour was Malik's recently confirmed engagement to Little Mix singer Perrie Edwards. But the 20-year-old kept details close to the vest.

"There's not much to say," Malik answered when asked about his bride-to-be. "We're engaged. We're really happy."

Before Malik could answer the hosts' question about a wedding date, Horan chimed in with a bit of his own news:

"I'm pregnant," he said joking. "It's exclusive to the 'Today' show."

Be careful about starting rumors, Niall! Of course, speculation surrounding the guys' personal lives is a constant, and Styles recently told Us magazine that somethings are unavoidable, like a certain ex using your romance as creative inspiration.

"It would be hypocritical for me to say she couldn't do it because everybody writes songs based on personal experience," Styles said of former love interest Taylor Swift. "I can't say I'd have dated someone less famous to avoid it." He added: "At least she's a great songwriter!"

1D fans will want to mark their calendars for several can't-miss events over the coming days. On Saturday, MTV News' Josh Horowitz will sit down with "This Is Us" director Morgan Spurlock at 7 p.m. ET to talk about the making of the documentary, in addition to debuting brand-new interview footage with the guys, during the VMA All Access Experience. Send your questions via Twitter, Instagram or Vine using the hashtag #AskVMA.

On Sunday, the boy-banders will be at the 2013 MTV Video Music Awards where their "Best Song Ever" is nominated for Best Song of the Summer.

It all goes down from Brooklyn's Barclays Center on Sunday, August 25 at 9 p.m. ET/PT.