Elizabeth Olsen engaged to Boyd Holbrook

Elizabeth Olsen is reportedly engaged to her actor-boyfriend Boyd Holbrook.

"They've been by each other for a while, taking a lot of couple time," one source told Us Magazine. They've been "talking about getting engaged" and recently took a trip to Paris together.

The seriousness of their relationship was obvious, another source adds. "They moved into a place in Brooklyn a few months ago."

The announcement comes just weeks after one of her famous twin sisters, Mary-Kate, broke the news that she was engaged to Olivier Sarkozy.

The littlest Olsen sister, 25, and Holbrook, 32, have been dating since Dec. 2012 after they first met on the set of their movie "Very Good Girls." The flick also starred Dakota Fanning and Demi Moore and, at the time, their affection for one another was in plain sight.

"There was great chemistry there," an insider revealed at the time. "She really likes him!"

It seems wedding bliss is in the air for the Olsen family, with Mary-Kate, 27, and her French banker beau-now-fiancé, 44, set to walk down the aisle and talk of them starting a family together circulating. According to one source, they're "talking about trying to get pregnant." But the "Full House" star's twin sister Ashley is not out of the mix. She, too, has been bitten by the romance bug, and is now dating "Moneyball" director Bennett Miller.

It is not clear which of the Olsen sisters is going to walk down the aisle first.

During an appearance last month on "Watch What Happens Live," Elizabeth admitted that one of her sisters forgot to wish her a happy birthday.

"Ashley remembered my birthday, but I don't hold grudges against Mary-Kate forgetting mine," she replied when a fan asked who her favorite sister was.

Elizabeth insisted the family is "all very close."