Paula and Bridgette Powers, 47, from Queensland , went viral after appearing on Australian channel Seven News to share their witness account of an alleged car jacking.
The Queen, 77, was welcomed to the set in London by Dame Carolyn McCall, the chief executive of ITV, lead actress Vicky McClure, and Trigger Point's executive producer Jed Mercurio.
Despite departing his role on the ITV show four years ago, the 58-year-old presenter still made sure to gather some of his closest showbiz pals for a festive bash on Friday night.