The happy couple shared its excitement with close friends and family at posh eatery Press Lounge just weeks before the pregnant Wedding Singer star is reportedly due to exchange vows with the art consultant next month (Jun12).
Barrymore's best pal and former Charlie's Angels co-star Cameron Diaz was on hand to lend her support to the bride-to-be, who concealed her baby bump in a blue maxi dress and black blazer.
The small bash capped off an exciting day for Barrymore - she was snapped trying on wedding veils at Suzanne Couture Millinery in Manhattan's Upper East Side with her future mother-in-law Coco on Friday afternoon and she later attended a pre-natal yoga class, according to UsMagazine.com.
This will be Barrymore's third marriage - she was wed to Los Angeles bar owner Jeremy Thomas for two months back in 1994 and she walked down the aisle with comedian Tom Green in July 2001 but they split later that year (01).
The actress has also celebrated her engagement to Kopelman on the West Coast - Charlie's Angeles producer Leonard Goldberg and his wife Wendy threw the beauty a small wedding shower in Los Angeles last month (Apr12).