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Just two months after giving birth, Ivanka Trump is already golfing like a BOSS -- crushing a tee shot in front of the best female golfers in the world ... while wearing heels!

Donald's daughter was at Trump National Golf Club Bedminster in Jersey ... gearing up for the 2017 Women's Open with Cristie Kerr, Paula Creamer and Brittany Lincicome when they decided to show off their swings.