Katie Lee stopped by The Soft Serve Fruit Co. at Hampton Coffee Company in Water Mill for a banana/dark chocolate swirl on Sunday. Cool. Oprah’s favorite party planner, Colin Cowie, got some R&R at Southampton Inn after a Havana Nights themed party. New York Knick Jason Kidd enjoyed Sunday brunch with his wife, son and a couple of friends at the Southampton hotspot 75 Main. Other boldfaced names at 75 Main last week include: Jonathan Cheban from “The Spin Crowd,” “New York City Housewife” Ramona Singer, NBC’s Jane Hanson, Amy Winehouse’s family and Richard Johnson and Emily Smith from The New York Post. Cameron Diaz and friends enjoyed a recent afternoon meal at Bostwick’s Chowder House in East Hampton.