Their age gap has kept tongues wagging since they were first linked last fall.

And Scott Disick was happy to flaunt his relationship with Amelia Hamlin via a very racy Instagram on Sunday.

The Keeping Up With The Kardashians personality, 38, proudly posted a photo of his 19-year-old love reaching up towards the top of a book shelf dressed scantily in a revealing lingerie ensemble.

‘A little high, almost there,’ he wrote across the photo that shows her backside nearly in full view,…