Hip-hop superstar 50 Cent is set to make his 37th birthday on Friday extra special for fans by giving away his new album for free.

The In Da Club hitmaker's follow-up to 2009's Before I Self Destruct has been delayed since last year, when he entered into a war of words with Interscope Records bosses for "moving in slow motion."

He recently revealed his next project would be called 5 (Murder by Numbers), but it won't be his official Interscope disc - that album, titled Street King Immortal, will hit music retailers in November.

In the meantime, 50 will give fans a special treat in celebration of his birthday by making Friday's release available for download online, completely free of charge.

In a series of Twitter.com posts, he writes, "You can't buy album 5 it's FREE. Street king immortal will be for sale... The full CD will be out on my birthday."