Justin Bieber collaborates with R. Kelly

Pop star Justin Bieber has collaborated with American singer-songwriter and record producer R. Kelly for on a song, which will be released next week.

The "Never Say Never" singer will release the song as part of his Music Mondays series, reports femalefirstc.co.uk.

"I just did a song (with him). (Justin) just called me to do a song, and it's hot," R. Kelly told Vibe magazine.

"He wanted to go and do some R&B stuff, so we got together and did that," he added.