Justin Timberlake has admitted his surprise at his new album's popularity.

The singer recently released comeback record 'The 20/20 Experience' as he marked his return to music.

It hit No.1 in the UK and similarly in the US too, selling just under one million units in America during its first week.

Taking to Twitter to thank fans for their support, Timberlake said:

"Whoa...Speechless. Shocked. Numbers go up, numbers go down. I just hope this album makes your Summer...You already made mine #bestfansever."

The album, meanwhile, has broken the iTunes record for the most album sales in a first week.

It managed to shift 580,000 online copies in just seven days as the world lapped up Timberlake's new record.