Justin Bieber "Boyfriend" To debut with sale of 400,000 copies this week

The most anticipated single of most awaited single will rock the market this week. 
"Boyfriend" is already top in 32 countries on Itunes Charts. 
Now according to market experts Justin is set to shift 400,000 in US this week. 
Katy Perry's "Part Of Me" is best seller this year till now, selling 411,000 copies in its first week of release.
Will Justin Bieber be able to break the records ? Drop down comments !