The newly engaged couple started dating a year ago while Elba was filming The Mountain Between Us in Dhowre's home country, Canada, where she won 2014's Miss Vancouver.
The Luther heartthrob popped the question before a screening of his new movie at Dalston's Rio Cinema this morning. Once she accepted his proposal he stood and she wrapped her arms around him tightly.
They posted: 'Another @Riocinemafirst!
Other followers confirmed they'd witnessed the happy event.
With Valentine's Day just days away, it's undeniable that romance is in the air-well, at least it is for Idris Elba.
But Idris Elba, 45, had a change of heart as the happy news he got engaged to his stunning girlfriend Sabrina Dhowre, 29, was announced on Saturday.More news: South Korean president, US Vice President, to meet North Korean leader's sister
The highly photogenic couple look very much in love, and have picked the flawless moment to get engaged with Valentine's mere days away.
Idris got down on one knee just six months after he vowed he would never walk down the aisle again.
"Falling in love while making a movie about falling in love is pretty special", Elba said past year.
Elba has been married twice in the past to Hanne "Kim" Norgaard from 1999 until 2003 and to Sonya Nicole Hanklin back in 2006.
Idris has a 15-year-old daughter, Isan, with Kim and a three-year-old son named Winston whose mother is his former girlfriend Naiyana Garth.