Paris Hilton and her boyfriend, Cy Waits, indulged in some PDA as they arrived at a cocktail party in Mexico City last night. They were celebrating the launch of Paris's new shoe collection after meeting with fans and chatting up the line at a press conference earlier in the day. She shared her excitement for the project, saying, "The girls all love my style. When they buy my products they can be like me!" Paris headed south of the border following a charity event benefiting Japan relief in LA over the weekend. Perhaps she and Cy will extend their stay in the country and head west to Cabo for some hot bikini time on the beach before heading back home.