Will.I.Am: 'It Was Tough To Get Bieber For Video'
Rapper says JB was almost too busy to shoot #thatpower promo...
In the promo, Bieber appears as a hologram - with Will explaining that due to JB's hectic tour schedule, it was hard to lock down the teen idol to shoot his scenes.
Speaking to ET Online, The Voice coach said: "[Justin's] on tour. It was tough to get this video [done].
"I had to fly to Barcelona to shoot Justin Bieber then flew to Japan to work with Rio and the boys on the choreography for it. So it was a lot of trekking."
When asked how their hit duet came about, Will said: "He was my next-door neighbour last year. And I called him on the phone when I saw his car outside. And he came to the crib and we made that song and then he moved."
The Black Eyed Peas star recently defended Biebs after his recent run of bad press, telling The Sun: "Justin is a great talent. Of all the people I have worked with over the past five years he is one of the best.
"I remember when I was 19, it was pretty tough. The difference between me and him is that I got to grow up in private, he is growing up in front of everybody."
He went on: "He is handling everything pretty sanely. Anyone else would go insane under that freaking microscope of scrutiny and judgment."
Bieber also hit the headlines this week after a fan jumped on stage and grabbed him during his gig in Dubai.