Gomez, 21, said that they have fought like siblings since they became close, reported Comtactmusic.
"I think what people forget is that she's actually been there for me, too. I've known her since... We were best friends since we were seven.
"We had a time where we did grow apart, but there's not a single person on this planet that knows me like she does. She goes into my darkest place, and she goes into my lightest most incredible memories. There's nothing like her and there's nothing like us, so I will always cherish her... She's like my sister. I'm very, very proud of her.