Grey's Anatomy actress Ellen Pompeo and music exec Chris Ivery quietly tied the knot last week. The pair, who have been engaged for a year, wed Friday at 11:30 a.m. in a brief ceremony at New York's City Hall, where mayor Michael Bloomberg served as their witness. "The mayor was in midtown for his weekly radio show, and he came back [downtown] for a series of meetings at City Hall, and this was one of the things he had planned," said Bloomberg's rep. "The mayor was gracious." The Boston Globe first reported the news. "They are over the moon," the Globe quoted Pompeo's rep as saying.