The 22-year-old singer announced last month that she was replacing model Georgia May Jagger as the face of the US label, the brainchild of pop legend Madonna and her daughter, Lourdes.
Following speculation that she had signed a lucrative $760,000 contract.
Following her appointment, Madonna and Lourdes admitted they were thrilled to have her onboard.
‘Rita is a talented beauty but what really drew us to her is the confidence she oozes through her music and her unique sense of style,’ they said in a statement. ‘On stage or off, in photos or in the street – she’s a magnet!
In an exclusive photo from the campaign, Rita wears a simple summer dress as she poses on the top deck of a London bus.
Another distinctly patriotic shot from the campaign shows the singer wearing a soldier's bearskin hat while offering a salute outside the gates of Buckingham Palace.
See more pictures from the campaign shoot.