Brie Larson gets engaged to boyfriend Alex Greenwald

Oscar-winning actress Brie Larson has got engaged to musician boyfriend Alex Greenwald.

The 26-year-old '

Room

' star was seen rocking a diamond ring on her finger when making debut as a host on '

Saturday Night Live

' during the weekend, reported US magazine.

Brie Larson wins Best Actress Oscar for 'Room'

A source said that 36-year-old Greenwald, the

Phantom Planet

frontman, proposed to her during a trip to Tokyo in March.

Larson first publicly confirmed her relationship with Greenwald at the

Gotham Independent Film Awards

in 2013.

WATCH: OSCARS 2016 | Brie Larson Wins Best Actress for 'Room'