Britain's Queen Elizabeth, Prince Philip, and Prince William
Britain's Queen Elizabeth (C), Prince Philip (R), and Prince William, walk amongst spring blossom and flowers as they arrive to attend the unveiling of the Windsor Greys statue in Windsor southern England March 31, 2014. The statue marks sixty years of Queen Elizabeth's Coronation in 2013 and the important role played by Windsor Greys in the ceremonial life of Britain's royal family. Reuters/Toby Melville

"Deeply concerned" about palace's security, the police guarding the royal residences are alarmed by the increasing number of unvetted guests of the palace staff. Thanks to the popular dating apps, Tinder and Grindr, many of the staff's overnight guests appears to be a casual acquaintance they met online.

Tinder and Grindr allows smartphone users to find to their potential match by the use of GPS locators which sparked an internal security fears for palace guards. With millions of users around the world, the online dating apps has been criticized in promoting casual sex and a number of Queen Elizabeth's 800-plus stuff are reportedly using the dating tools, Mail Online reports.

"There are real and serious security concerns at Buckingham Palace about members of staff use of dating apps such as Tinder, which can be rather sleazy," a source revealed during an interview with the publication. "The palace police are particularly unhappy about the number of guests of servants staying overnight, especially when they may have only just met on Tinder."

An "Achilles heel" to palace security, former head of royal protection, Chief Superintendent Dai Davies, revealed that staff living in Royal Mews and Kensington Palace are still permitted to bring back unvetted guests. Making a mockery of the security structure, most of the staff's guests are complete strangers which could be a big threat to the royal family's security.

Even without the dating apps, Davies believed that the security risk is not new when he was appointed as unit commander in 1995 for the Queen's protection and her family. With so many security threats coming from all direction, he added that staff bringing unvetted guests is still a big security concern.

Not discussing any security matters, the Buckingham Palace spokesman declined to comment about the security issue regarding staff's using the dating apps. But one official explained that all palace workers are aware about the internal policy of bringing guests in the palace and even rejected the "internal link" of using Tinder and Grindr and the palace security.

Meanwhile, Queen Elizabeth has made Michael Bloomberg, a former New York City major, an "honorary" knight of British monarchy. In his efforts of strengthening the bond between the U.S. and UK, Bloomberg has played a major role in "forging transatlantic diplomatic, economic, and cultural ties."

Other Americans who received an honorary knighthood includes Bill Gates, Steven Spielberg and just recently, Hollywood star Angelina Jolie was made an honorary dame. The businessman also followed the footsteps of his predecessor, Rudy Giuliani, for accepting the honour.