Rain nearly ruined a surprise beachside Hamptons celebration for First Girlfriend Sandra Lee. The Food Network star and Gov. Andrew Cuomo were among the first to arrive at the lobster bake at Wyandanch Beach, decorated with Tiki torches and a canopy for guests, in Southampton Sunday. Another unidentified guest was seen arriving with a cake with an Emmy Award on top. Last month, Lee won Daytime Emmys for Outstanding Lifestyle/Culinary Host and “Achievement in Makeup.” Lee also celebrated her 46th birthday on Tuesday. A witness told us, “The governor suggested they tough it out in the rain under the canopy, but as the rain got heavier, it was decided to head indoors.” The couple were spotted helping to load the food back onto a Seasons of Southampton Caterer truck before they all left to continue the party at a private home. Reps for Cuomo didn’t comment. A spokeswoman for Lee said it was a surprise party for Lee, thrown by her girlfriends, to celebrate her two Emmy wins and her birthday, and confirmed they moved to a private address.