Princess Beatrice and her sister, Princess Eugenie, hung out in Rome on Sunday in the wake of yet another high-profile set of "I dos." The duo was in Italy to attend Petra Ecclestone's wedding to James Stunt in the city Saturday. Both Paris and Nicky Hilton and the Black Eyed Peas were also among the weekend's high-profile guests. On Sunday, Princess Beatrice and her boyfriend, Dave Clark, checked out the romantic Spanish steps, and both she and her sister were spotted out on a power walk around the city. Beatrice and Eugenie were all decked out for Saturday's ceremony alongside their mother, Fergie, though the girls went their separate ways to take in the city's sights the following morning.