Donald Trump's daughter Tiffany engaged to 23-year-old billionaire Michael Boulos

Donald Trump 's youngest daughter Tiffany Trump has announced her engagement.

The 27-year-old said "Yes" when her 23-year-old billionaire boyfriend Michael Boulos popped the all-important question.

Tiffany rushed to Instagram - just one of the many social media platforms her dad Donald is blocked from using - to announce the exciting news.

Gushing over her new fiancé, Tiffany admitted it was an "honour" to "celebrate many milestones" at the White House during her dad's presidency, the most significant of which being her engagement.

"It has been an honour to celebrate many milestones, historic occasions and create memories with my family here at the White House, none more special than my engagement to my amazing fiancé Michael," she penned.

"Feeling blessed and excited for the next chapter," she added.

Alongside the sweet note, Tiffany shared a snap of the loved up pair posing outside the White House.

"Love you honey," her soon-to-be husband wrote in the comments section.

Tiffany was spied flashing her huge diamond engagement ring in the snap, while she put her other arm around her man.

Meanwhile Michael opted for an American flag pin showing support for his fiancée's home country.