Take Me Home Tour: One Direction Tour Starts In Tokyo, Harry Styles And Niall Horan Have Twitter Fun With A Nip Slip [PHOTO]

One Direction is getting ready for their "Take Me Home" tour and Niall Horan is updating fans on the progression of rehearsal which he says, "sounding big."

The whole band, Liam Payne, Zayn Malik, Louis Tomlinson and Harry Styles will be heading to Tokyo, Japan Saturday before going off for their international tour in venues in the UK, the US, Canada, and Mexico. 

Nail tweeted his excitement, "Rehearsals goin really well for tour!" He added, "Settin down vocals and harmonies at the moment! #TMHtour.

The anxious singer continued his tweets adding, "Unbelievable rehearsal with @JohnShoneKeys @JoshDevineDrums @SandyBeales and @GuitarManDan today! Sounding big... can't tell ya which ones," Niall also posted, promising he won't reveal the tour's set list just yet. "Can't sleep... been practising all night for tour!"

Harry Styles took his time to not worry about his break up with Taylor Swift to have some fun with a candid photo of Niall Horan's "nip slip."