I couldn't find any information about a sequel to The Devil Wears Prada titled "The Devil Wears Prada 2" featuring someone named Calum Harper.
However, I do know that there was a film titled "The Devil Wears Prada" released in 2006, which was a comedy-drama film based on Lauren Weisberger's 2003 novel of the same name. The film starred Anne Hathaway and Meryl Streep. There have been reports about a potential sequel, but I couldn't find any information about a confirmed sequel with Calum Harper in a cameo or starring role.
It's worth noting that there have been reports of a TV series titled "The Devil Wears Prada" in development, which is a limited series based on the novel.
