Fourth Impact will be singing I'll Be There by Michael Jackson on Saturday
Speaking to HELLO! Online, Mylene and Irene - one half of the Filipino girl group - shared details of Cheryl's generosity. Irene said: "She even gave us three perfumes each and eyelashes! An advanced Christmas gift. She can be our 5th Impact because she's so kind and sweet."
The two sisters, who are usually joined by Amira and Celina, had only good things to say about their mentor. Mylene said: "She always hugs us!" and Irene added: "She never acts like she's a superstar, she doesn't act like she's up there. She feels like our big sister. She's so sweet and always there for us."
Cheryl oftens shares photos in support of her groups
"She always calls us into her dressing room before each show to make sure everything is ok. She asks us what we want what we need and she gives us a lot of motivation to do well."
The group, who are well known for their fast-paced songs and dances, are excited about their chance to sing a ballad this weekend. Irene revealed: "It's very different, finally! You see two different sides of Fourth Impact this week. We're so excited and again so nervous about being in the final five!"
Mylene added that their Geordie mentor was "very happy" with their rehearsals. The star has been working with the girls on something very different for this weekend.
Irene explained: "She said less is more. She decided to keep the choreography simple and so were just going to stand and sing and not swivel our chairs around. She wants us to focus just on the vocals. Hopefully all the people will like it!"
Cheryl treated her girl band to perfume and eyelashes
The girls have swiftly won over the UK public - but they are missing support at the live shows from some very special family members. "Our father really wanted to come over and our brother and sister," explained Irene. "It's hard being apart and there isn't enough time to Skype. We're always rehearsing.
"But now they're fixing all their visas and our dad said 'do your best so we can come there'. There's so much pressure. It'll be their first time in the UK and also his first time flying!
When asked which celebrity guest performance they would most like to sing with if they make it through to next week, Irene said: "Definitely Beyoncé! But if it's impossible our own mentor Cheryl. Or One Direction or Little Mix."