The agreement, which is effective immediately, was sealed by EMI Music Publishing UK's Guy Moot, president UK and European A&R, and Dan Lloyd-Jones, VP A&R, with EMI Music Publishing North America's Jon Platt, president of North American Creative.
Originally from Chicago and now hailing from Brooklyn, New York, the sibling duo of Natalie Bergman and Elliot Bergman started gathering a fan base after posting their first track to their Bandcamp page, 'Keep You', earlier this year.
Roger Faxon, EMI Group CEO, said: "EMI is the perfect home for Wild Belle and I'm thrilled that Natalie and Elliot have chosen to join us.
"Our European and North American teams have worked hand-in-hand to bring this agreement to completion and I've no doubt that Wild Belle and EMI Music Publishing will have a long and very successful association together."
The band have just performed at this year's Coachella Festival in California and last month appeared at SXSW in Texas. They are currently finishing off their debut album, which has been described as drawing on influences ranging from electro-pop to reggae.