Drew Barrymore engaged

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Wedding bells are in the air for Drew Barrymore and her boyfriend – art consultant Will Kopelman.

They got engaged in Sun Valley, Idaho, a source tells PEOPLE. The ring is by Graff, and "they are very happy together," adds the source.

Barrymore spent about 10 days over the Christmas holiday in Sun Valley with Kopelman, where they were spotted at the romantic Vintage restaurant and picking up organic salads at Kiki's Café. Onlookers tell PEOPLE when spotted out and about, the couple graciously posed for pictures.

It will be the third time down the aisle for Barrymore, 36, who was married to Tom Green from 1999 to 2001 and to Jeremy Thomas briefly in 1994.

Barrymore's rep didn't immediately respond to request for comment.