She has a handful of famous friends. Yep, Jessie is friends with Benji and Joel Madden (they're also her managers), Ellie Goulding, Jason Derulo, Tinie Tempah, and British TV presenter Fearne Cotton. She's written a bunch of your favourite songs. Before branching out as a singer, Jessie wrote hits like Miley Cyrus's "Party in the U.S.A," David Guetta's "Repeat," and Chris Brown's "I Need This." Image Source: Instagram user Jessie J