The bisexual singer has long admitted she has a crush on the 'You Da One' hitmaker, and after meeting her she thinks she is now even more attractive.
She said: ''Rihanna's always up there - I love her swagger. I've met her a few times, she's really lovely and so beautiful in real life.''
As well as Rihanna, hunky model Tyson Beckford is also on Jessie's list of celebrity crushes.
She said: ''I wouldn't kick Tyson out of bed! He's amazing, he's beautiful.''
The 24-year-old pop star is well known for her skimpy outfits and confident demeanour, but admits she would actually like to gain weight and have a curvier figure.
She told more! magazine: ''I think I'm too skinny. I'd love to gain some weight. Especially since my leg injury, which meant I lost weight on that leg. I'd like to be a size 10-12 and I'm currently a size 6-8.
''I've also got one bit of my bum crease that's lower than the other, because my back is a bit wonky. But realistically I can walk, I can talk, I can hear and sing and I have good skin, so it's all OK.''