Rihanna Is On The Lookout For Fresh Songs

Rihanna wants new music, and she's in London to find it! Well, that, and some suggestive graffiti ... um, "Mine Is Bigger Than Yours."

RiRi's mentor Jay-Z is helping with the music process by holding a writing camp to host the world's biggest producers, according to The Sun.

A source tells the site, "Sean Garrett, who Jay nicknamed “The Pen”, is over and so is producer Bangladesh, who has worked with Usher, Nicki Minaj and Beyonce.”

Also reportedly taking part in the camp ... Swedish House Mafia, Calvin Harris and Dr. Luke.