Elvis Presley's granddaughter has got engaged

Taking to his Facebook page, he posted a photograph of him and Riley and her diamond sparkler, which he accompanied with the caption: "So that happened..."

The couple went public with their relationship earlier this year after reportedly meeting on the set of 'Mad Max: Road Fury,' which is set for release in 2015.

A source said previously: "Ben worked as a stuntman alongside Riley on the set of 'Mad Max: Fury Road.' They've become inseparable."

Meanwhile, Riley was engaged to her 'Magic Mike' co-star Alex Pettyfer in 2012 but they called off their romance later that year, before briefly rekindling in 2013.

She was also romantically linked to 'Twilight' hunk Robert Pattinson, but despite speculation they had briefly dated, Riley is still good friends with Robert's ex-girlfriend Kristen Stewart, whom he dated for four years.

Riley, the daughter of Lisa Marie Presley and Danny Keough, is the eldest granddaughter of 'the King.'