Sienna Miller packed up her bikinis and left Ibiza after a weekend of dancing and partying with some of Prince Harry's guy friends on the island. She was back in London last night to have dinner with an older male pal, whom she kissed on the cheek as they parted ways. Sienna wasn't the only one to be seen with someone else, though; her boyfriend Balthazar Getty was spotted chatting with a mystery blonde back home in LA. It's unlikely that Sienna has anything to worry about, since her current romantic situation could hardly get more complicated than it already is.