Rita Ora still isn't ''comfortable'' with Jay Z being her boss.

The 'How We Do (Party)' hitmaker feels very lucky that she gets to work alongside the hugely successful rap mogul, who signed her to his music label Roc Nation in 2009, but admits she often finds it overwhelming.

The 23-year-old singer said: ''I still can't believe Jay Z is my boss, it never sits comfortably with me.''

The blonde beauty, who is dating Scottish DJ Calvin Harris, also claims she felt like an ''amateur'' on the set of her debut movie, 'Fifty Shades of Grey,' but hopes to land more film roles in the future, as she really enjoyed ''learning'' from her co-stars on the upcoming blockbuster adaptation of E.L. James' novel.

The 'R.I.P.' singer, who performed at the Belvedere Vodka after party at the Cannes International Film Festival on Friday night (16.05.14), said: ''I've never been to Cannes, but I'd love to get into this world.''

She added: ''Working on 'Fifty Shades of Grey,' I feel like an amateur in the background just watching and learning.''

Rita - who stunned the crowd in two Roberto Cavalli dresses and is staying on his boat in the South of France - is currently gearing up to release her second album and hopes to embark on her first world tour soon.

The singer is very excited for her fans to hear her new music.

She said: ''I've done a song with Prince, it's going to be on the new album. Prince is a genius.

''Me and Calvin have worked together on a few tracks, he's so talented.''