Photography by Jess Diab and Orlando Soria Dear Party Diary, I had the honor of being invited to a party hosted by Anna Camp, Skylar Astin (of “Pitch Perfect” fame), and American Express last week. It was in a fancy mid-century home in Beverly Hills. The party was filled with tips and tricks from Anna and Skylar about how to host a fun holiday. There were crafts, there were drinks, but most importantly, there were celebrities wandering around giving tips on how to have the most epic holiday season ever. This is the view from the pool: Ugly, right? There…