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Gwyneth Paltrow and interior designer Windsor Smith gave new meaning to the phrase “love thy neighbor” on Monday night. The actress hosted an intimate supper at Smith’s home to toast the decorator and her latest coffee-table tome “Homefront,” for which Paltrow penned the foreword.

“We share a home, but we don’t live together,” said Paltrow. “We met after I walked into a house she had done across the street, and I fell in love with the house, and I bought [it].” That was nearly four years ago, when Paltrow returned to her hometown “after years of being an expatriate in London.”

Smith added, “It was like twins separated at birth, but she got the long legs and great bone structure. We literally finish each other’s sentences.” Needless to say, Paltrow hired Smith to decorate the home, and together they added a pool and screening room. “She’s protective and warm and brilliant,” said Paltrow. “I’m so lucky I met her through the house.”

“She’s actually taught me a few tricks because she’s much more contemporary and I have an antiques background,” said Smith.

About 40 of their closest mutual friends came to celebrate, including Maria Bello, Monique Lhuillier, Crystal Lourd, Shiva Rose and Eric Buterbaugh. “I’m afraid to spill anything,” said model Marloes Horst, glancing around the all-cream sitting room. Luckily, most guests decided to congregate in the kitchen.

Sighed Smith, “No matter how hard you work on the other parts of the house…” before Paltrow finished, “People always end up in the kitchen.”