They both appeared on Sunday night's X Factor results show, but their performances could not have been more different.
And now Rebecca Ferguson, 24, has publicly criticised Rihanna for being a bad role model for her fans.
The singer, who won high praise during her stint on X Factor last year for her demure, sophisticated performances, slammed the We Found Love hitmaker in an interview today.
Speaking to OMG Yahoo! Ferguson said: 'I wouldn't let my daughter watch her. As a woman, I want to teach my daughter that a man should love you for who you are.
'They should love you for you as a person, not for how you dress - and you don't have to be a sexual thing to a man.'(says the girl that was dating a fucking horny teenager.)
Rihanna, 23, has recently stated that she does not consider herself a role model for her young fans, that she 'just wants to make music.'
But Rebecca insists that the popstar lifestyle comes with responsibilities.(lol, like Rebecca became some huge star so she could say that.)
'Whether you like it or not, these popstars are role models,' she argued.
'They can say "I've got no kids," but if you want that lifestyle and you want that money, ultimately you are influencing generations and you have to remember that. They will copy you. Popstars should think of their audience.'
Ferguson was a runner-up in last year's X Factor final when Rihanna's racy performance attracted thousands of complaints.
At the time Ofcom said the routine was ‘at the very margin of acceptability’ after it received 2,868 complaints.
As a result, the regulator cautioned the 'family' show and issued new guidelines on pre-watershed programming.
Ferguson performed her soulful debut single Nothing's Real But Love on the programme on Sunday, before Rihanna stormed the stage with her latest hit We Found Love.
Despite toning down her outfit after last year's skimpy one caused such outrage, eagle-eyed viewers picked up on Rihanna's shoes, which had 'F***you' scrawled on them.
I love Rebecca's voice, but she is so boring, I wouldn't pay to see her in concert at all.
Janet's torment over school bullies
The redhead told earlier this week how she was tormented by her fellow pupils for not being "pretty enough".
But the 17-year-old, from Northern Ireland, said despite her life being made hell by the cruel taunts, she never let it get her down.
She said: "I had a problem making friends and it was tough. I wasn't cool - I had very long blonde frizzy hair, I never wore make-up and I wasn't pretty.
"People would take the mick out of me. I don't like talking about being bullied, but I forgave the girls who did it."
Now her mother Patricia has praised her "brave" decision to speak out about her suffering.
She told a newspaper: "It was just schoolgirls being silly but Janet being Janet coped with it and she has remained very loyal to her friends that stood by her.
"But like she said, she doesn't hold anything against them and that's not put on, she genuinely means that. It's all water under the bridge.
"But I wouldn't want anyone to think she's in X Factor because of what she went through.
"It had nothing to do with that, she went on X Factor for her. She's strong-minded and she only does things she wants to do."
Patricia added she was immensely proud of her daughter who has come in for some fierce criticism for being boring after initially being dubbed "the one to beat" from her very first audition.
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