With a famous A-lister brother, Lizzy knows all about the ups and downs of stardom, but she says if she were to become famous her life "wouldn't be the same" as R Patz...
And explaining why, she said: "I don't think any girls are going be throwing their knickers at me!"
After a close call at Boot Camp - Lizzy nearly lost her seat until Simon Cowell opted to send controversial singer Raign home instead - the 31-year-old found herself with a place at Judges' Houses and will be performing in front of Simon and Sinitta in LA.
With the hope to impress the judges, Lizzy revealed she opted for "quite an obscure" song choice but decided to go with it after brother Robert gave his approval.
"I sent [Robert] a link to the song I am performing. He said 'that sounds really cool' and thought it was a good song," she said.
And it's not only her song choices that Robert has been wanting to know.
Hoping his sister will dish him some exclusive goss, Lizzy claimed R Pattz loves hearing about the "craziness" of X Factor and "all the behind-the-scenes details".
Oh, if only we had our own insider too!
She may have a quirky song choice up her sleeve, but speaking ahead of her Judges' Houses audition Lizzy said her vocals aren't quite feeling up to scratch after losing her voice the day before heading to LA.
And, as if she wasn't nervous enough already, Lizzy admitted that anything could happen when she starts singing.
"I don't know what note is going to come out..."
Fingers crossed she can pull it out of the bag!
Judges' Houses in pictures:
Copyright: ITV Syco / Thames TV
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