X Factor sensation Mary Byrne will sing the Dusty Springfield classic You Don't Have to Say You Love Me this Saturday night.
The Ballyfermot star, dubbed MaBy, is expected to perform the mammoth hit this weekend in a bid to stay in the competition another week.
Last week saw her wow judges and the public alike by performing the James Brown classic It's A Man's Man's World to thunderous applause (video below).
Now that the pressure is on the mum-of-one, who's one of the hot favourites, and she'll be endeavouring to bring the house down again with another big ballad.
"Last week was a tough one for everyone because it was the first live show but this week will be even tougher for Mary now that she's shown what she can do," said a source. "Her fans are expecting another brilliant performance from her and to be blown away again by that big voice.
"It's nearly more important that she does well this weekend as she wants to prove it wasn't just a one-off performance.
"Louis has chosen a great song for her to sing.
"He just handed her his iPod and told her to listen to it over and over until she had it inside out.
"As she listened to it they just kept looking at each other, and then Mary started laughing nervously and they nodded to each other -- I think they both know this will be amazing, if she can nail it"
The single mum has been hit by a string of setbacks since making it to the finals of the popular singing competition, including suffering a bad case of laryngitis just before the first live programme.
This week saw her admit that she was called a "whore" after being left by her former partner after getting pregnant with her daughter Deborah (23).
The Tesco checkout worker was also embroiled in allegations of "fixing" after her employers sent emails to 300,000 staff urging them to vote for her.
The retail giant also paid for a TV advert to screen on TV3 during the X Factor's ad breaks with the message: "We're behind Mary".
This has prompted claims by fans of the show that she has been given a huge advantage over her fellow contestants who don't have such prominent support campaigns behind them.
But a Tesco spokesman has denied that they have engaged in anything untoward by getting behind her so prominently.
"We are fully supportive of Mary and so are her friends and colleagues at Tesco, but as to how anyone votes, that is up to them," he said.