They began dating back in 2003, and rumor has it Prince William will announce their engagement in June, with the royal wedding occurring in November 2011.

Journalist Tina Brown’s Daily Beast report on Tuesday (April 6), cites that June 3 and 4 are “mysteriously blocked out” on the Palace calendar which could possibly be for the announcement of an engagement – followed by a potential wedding in November.

And, while the royal family’s engagements are generally not publicized this far in advance, a source was happy to tell People (magazine) that Queen Elizabeth and Prince Philip, the Duke of Edinburgh, will be making an official visit to Plymouth, southwest England, on one of those days, June 3.

“We don’t comment on speculation,” a rep for Prince William told CNN when asked about the spreading rumor.