She captioned the snap: "Cheeky".
The former Australian Idol star has previously compared her bottom to a "marshmallow."
In October, she captioned an Instagram photo of her backside: "People don't believe me when I say I have a huge a**...I look like a big marshmallow."
"I guess I am a pear," she added, in reference to her body shape.
Looking good Ricki!
