Elizabeth Olsen has got engaged to Boyd Holbrook.

Less than two weeks after her sibling Mary-Kate accepted a proposal from her French beau Olivier Sarkozy, the youngest Olsen sister's has reportedly agreed to marry her actor boyfriend.

An insider told Us Weekly, ''They've been by each other for a while, taking a lot of couple time'', adding that the couple had been ''talking about getting engaged'' and recently went on a romantic minibreak to Paris.

Another source said: ''They moved into a place in Brooklyn a few months ago.''

Elizabeth, 25, and Boyd, 32, have been dating since meeting on the set of 'Very Good Girls', which starred Dakota Fanning and Demi Moore.

Meanwhile, Mary-Kate is yet to confirm reports that French banker Olivier proposed to her, but she fuelled rumours by flaunting a diamond sparkler on her ring finger.

The fashion designer and Olivier, who have been dating for two years, live in a $6.25 million townhouse in New York, and their union has caused some controversy due to their 17-year age gap.