The singer, who recently reformed with bandmates Liz McClarnon and Kerry Katona for ITV2 show The Big Reunion, said that the X Factor group remind her of Atomic Kitten in their early days.
Hamilton told MTV News: "I love Little Mix! They probably don't know Atomic Kitten, but when I saw them in the early stages [of The X Factor] they really did remind me of Atomic Kitten. They were young, raw and feisty."
Speaking of the reunion, Katona said: "I was really nervous about meeting up with the girls and being a part of Atomic Kitten again.
"But hand on heart, I feel like it has all just happened so naturally. It just clicked straight away and I know the three of us are older, wiser and so much more maturer.
"The good thing with us is we never ended on bad terms. It's been good fun, I feel like I'm 19 again."
Hamilton agreed: "When you grow up together in band, you've got a bond like sisters and that doesn't go away.
"We've done nothing but giggle, we are a bit achy because we've been in dance rehearsals, but we are going to put on the best show. We can't wait to show you guys."
B*Witched, Liberty X, 5ive, 911 and Honeyz will also make a comeback for The Big Reunion, which starts on ITV2 on January 31.
Watch Atomic Kitten's video for 'I Want Your Love' below: