Kim Kardashian's brother Rob sent gossip bloggers into a spin on America's Independence Day (04Jul14) by tweeting about a mystery son he'd fathered.

The reality Tv star took to on the eve of the big holiday and wrote about spending the 4th of July with his "little man".

He quickly deleted the tweet but not before it was picked up by online news outlets.

Reports at the end of last year (13) suggested Rob had a secret four-year-old son in Miami, Florida, but he had never confirmed the story.

As gossips tried to find out more about his mystery son, Kardashian, who previously dated Rita Ora, returned to early on Friday to reveal he was joking.

He wrote, "Those who know me know I play and I do Not have a Son. Y'all got my mama emailing me asking if I have a Son lol goodness hahaha."