Miley - who caused controversy at this year's VMAs with her twerking antics - bared her boob as she donned Kim's famous purple outfit that got everyone talking back in the day.
Tweeting a snap of herself all dressed up for a Halloween party, Miley wrote: "Happy Halloween @LilKim."
Kim was clearly flattered by her Miley's attempts at recreating her look, tweeting that she wanted to squeeze her exposed boob, which was only covered with a nipple pasty.
"Awwww. Look at my baby @mileycyrus tonight!!! Looking GORGEOUS!!! I wish was there to squeeze your boob :) :) Love U so much !!!! #mytwin," Kim wrote.
Miley has long been a fan of the controversial rapper, gushing in a recent interview: "In my past life, I feel like that was me. I feel like Lil Kim is who I am on the inside.
"She just makes me happy... I just love her. And I can't help that I love her."
Meanwhile, many celebs are also copying Miley's VMAs look for Halloween.
Paris Hilton was pictured brandishing a foam finger at a party earlier this week, while Hugh Hefner and his wife Crystal Harris dressed up as Miley and Robin Thicke to recreate their twerk-filled performance.